diff --git a/EEPROMAnything.h b/EEPROMAnything.h
new file mode 100644
index 0000000..b2a7515
--- /dev/null
+++ b/EEPROMAnything.h
@@ -0,0 +1,53 @@
+/*
+   MicroDexed
+
+   MicroDexed is a port of the Dexed sound engine
+   (https://github.com/asb2m10/dexed) for the Teensy-3.5/3.6 with audio shield.
+   Dexed ist heavily based on https://github.com/google/music-synthesizer-for-android
+
+   (c)2018 H. Wirtz <wirtz@parasitstudio.de>
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software Foundation,
+   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301  USA
+
+*/
+
+ // Idea from: https://playground.arduino.cc/Code/EEPROMWriteAnything/
+
+#include <EEPROM.h>
+#include <Arduino.h>  // for type definitions
+
+uint32_t crc32(uint8_t* calc_start, uint16_t calc_bytes);
+
+template <class T> int EEPROM_writeAnything(int ee, const T& value)
+{
+    uint8_t* p = (uint8_t*)(const void*)&value;
+    uint16_t i;
+    uint32_t checksum=crc32(p+4,sizeof(value)-4);
+
+    *p=checksum;
+
+    for (i = 0; i < sizeof(value); i++)
+          EEPROM.update(ee++, *p++);
+    return i;
+}
+
+template <class T> int EEPROM_readAnything(int ee, T& value)
+{
+    uint8_t* p = (uint8_t*)(void*)&value;
+    unsigned int i;
+    for (i = 0; i < sizeof(value); i++)
+          *p++ = EEPROM.read(ee++);
+    return i;
+}
diff --git a/MicroDexed.ino b/MicroDexed.ino
index f7dd9a6..64d633c 100644
--- a/MicroDexed.ino
+++ b/MicroDexed.ino
@@ -29,11 +29,12 @@
 #include <SD.h>
 #include <MIDI.h>
 #include <EEPROM.h>
+#include "EEPROMAnything.h"
 #include "midi_devices.hpp"
 #include <limits.h>
 #include "dexed.h"
 #include "dexed_sysex.h"
-
+#include "PluginFx.h"
 #ifdef I2C_DISPLAY // selecting sounds by encoder, button and display
 #include "UI.h"
 #include <Bounce.h>
@@ -50,89 +51,72 @@ uint8_t ui_main_state = UI_MAIN_VOICE;
 
 AudioPlayQueue           queue1;
 AudioAnalyzePeak         peak1;
-AudioFilterStateVariable filter1;
 AudioEffectDelay         delay1;
 AudioMixer4              mixer1;
 AudioMixer4              mixer2;
-AudioFilterBiquad        antialias;
 AudioConnection          patchCord0(queue1, peak1);
-AudioConnection          patchCord1(queue1, antialias);
-AudioConnection          patchCord2(antialias, 0, filter1, 0);
-AudioConnection          patchCord3(filter1, 0, delay1, 0);
-AudioConnection          patchCord4(filter1, 0, mixer1, 0);
-AudioConnection          patchCord5(filter1, 0, mixer2, 0);
-AudioConnection          patchCord6(delay1, 0, mixer1, 1);
-AudioConnection          patchCord7(delay1, 0, mixer2, 2);
-AudioConnection          patchCord8(mixer1, delay1);
-AudioConnection          patchCord9(queue1, 0, mixer1, 3); // for disabling the filter
-AudioConnection          patchCord10(mixer1, 0, mixer2, 1);
+AudioConnection          patchCord1(queue1, 0, mixer1, 0);
+AudioConnection          patchCord2(queue1, 0, mixer2, 0);
+AudioConnection          patchCord3(delay1, 0, mixer1, 1);
+AudioConnection          patchCord4(delay1, 0, mixer2, 2);
+AudioConnection          patchCord5(mixer1, delay1);
+AudioConnection          patchCord6(mixer1, 0, mixer2, 1);
 #if defined(TEENSY_AUDIO_BOARD)
 AudioOutputI2S           i2s1;
-AudioConnection          patchCord111(mixer2, 0, i2s1, 0);
-AudioConnection          patchCord112(mixer2, 0, i2s1, 1);
+AudioConnection          patchCord7(mixer2, 0, i2s1, 0);
+AudioConnection          patchCord8(mixer2, 0, i2s1, 1);
 AudioControlSGTL5000     sgtl5000_1;
 #elif defined(TGA_AUDIO_BOARD)
 AudioOutputI2S           i2s1;
 AudioAmplifier           volume_r;
 AudioAmplifier           volume_l;
-AudioConnection          patchCord11(mixer2, volume_r);
-AudioConnection          patchCord12(mixer2, volume_l);
-AudioConnection          patchCord13(volume_r, 0, i2s1, 1);
-AudioConnection          patchCord14(volume_l, 0, i2s1, 0);
+AudioConnection          patchCord7(mixer2, volume_r);
+AudioConnection          patchCord8(mixer2, volume_l);
+AudioConnection          patchCord9(volume_r, 0, i2s1, 1);
+AudioConnection          patchCord10(volume_l, 0, i2s1, 0);
 AudioControlWM8731master wm8731_1;
 #else
 AudioOutputPT8211        pt8211_1;
 AudioAmplifier           volume_master;
 AudioAmplifier           volume_r;
 AudioAmplifier           volume_l;
-AudioConnection          patchCord11(mixer2, 0, volume_master, 0);
-AudioConnection          patchCord12(volume_master, volume_r);
-AudioConnection          patchCord13(volume_master, volume_l);
-AudioConnection          patchCord14(volume_r, 0, pt8211_1, 0);
-AudioConnection          patchCord15(volume_l, 0, pt8211_1, 1);
+AudioConnection          patchCord7(mixer2, 0, volume_master, 0);
+AudioConnection          patchCord8(volume_master, volume_r);
+AudioConnection          patchCord9(volume_master, volume_l);
+AudioConnection          patchCord10(volume_r, 0, pt8211_1, 0);
+AudioConnection          patchCord11(volume_l, 0, pt8211_1, 1);
 #endif
 
 Dexed* dexed = new Dexed(SAMPLE_RATE);
 bool sd_card_available = false;
-uint8_t midi_channel = DEFAULT_MIDI_CHANNEL;
 uint32_t xrun = 0;
 uint32_t overload = 0;
 uint32_t peak = 0;
 uint16_t render_time_max = 0;
-uint8_t bank = 0;
 uint8_t max_loaded_banks = 0;
-uint8_t voice = 0;
-float vol = VOLUME;
-float pan = 0.5f;
 char bank_name[BANK_NAME_LEN];
 char voice_name[VOICE_NAME_LEN];
 char bank_names[MAX_BANKS][BANK_NAME_LEN];
 char voice_names[MAX_VOICES][VOICE_NAME_LEN];
 elapsedMillis autostore;
-uint8_t eeprom_update_status = 0;
-uint16_t autostore_value = AUTOSTORE_MS;
 uint8_t midi_timing_counter = 0; // 24 per qarter
 elapsedMillis midi_timing_timestep;
 uint16_t midi_timing_quarter = 0;
 elapsedMillis long_button_pressed;
-uint8_t effect_filter_frq = ENC_FILTER_FRQ_STEPS;
+uint8_t effect_filter_cutoff = 0;
 uint8_t effect_filter_resonance = 0;
-uint8_t effect_filter_octave = (1.0 * ENC_FILTER_RES_STEPS / 8.0) + 0.5;
 uint8_t effect_delay_time = 0;
 uint8_t effect_delay_feedback = 0;
 uint8_t effect_delay_volume = 0;
 bool effect_delay_sync = 0;
 elapsedMicros fill_audio_buffer;
-
+elapsedMillis control_rate;
+uint8_t active_voices = 0;
 #ifdef SHOW_CPU_LOAD_MSEC
 elapsedMillis cpu_mem_millis;
 #endif
-
-#ifdef TEST_NOTE
-IntervalTimer sched_note_on;
-IntervalTimer sched_note_off;
-uint8_t _voice_counter = 0;
-#endif
+config_t configuration = {0xffff, 0, 0, VOLUME, 0.5f, DEFAULT_MIDI_CHANNEL};
+bool eeprom_update_flag = false;
 
 void setup()
 {
@@ -159,9 +143,10 @@ void setup()
   Serial.println(F("MicroDexed based on https://github.com/asb2m10/dexed"));
   Serial.println(F("(c)2018,2019 H. Wirtz <wirtz@parasitstudio.de>"));
   Serial.println(F("https://github.com/dcoredump/MicroDexed"));
+  Serial.print(F("Version: "));
+  Serial.println(VERSION);
   Serial.println(F("<setup start>"));
 
-  //init_eeprom();
   initial_values_from_eeprom();
 
   setup_midi_devices();
@@ -192,7 +177,7 @@ void setup()
   Serial.println(F("PT8211 enabled."));
 #endif
 
-  set_volume(vol, pan);
+  set_volume(configuration.vol, configuration.pan);
 
   // start SD card
   SPI.setMOSI(SDCARD_MOSI_PIN);
@@ -210,13 +195,13 @@ void setup()
 
     // read all bank names
     max_loaded_banks = get_bank_names();
-    strip_extension(bank_names[bank], bank_name);
+    strip_extension(bank_names[configuration.bank], bank_name);
 
     // read all voice name for actual bank
-    get_voice_names_from_bank(bank);
+    get_voice_names_from_bank(configuration.bank);
 #ifdef DEBUG
     Serial.print(F("Bank ["));
-    Serial.print(bank_names[bank]);
+    Serial.print(bank_names[configuration.bank]);
     Serial.print(F("/"));
     Serial.print(bank_name);
     Serial.println(F("]"));
@@ -233,29 +218,25 @@ void setup()
 #endif
 
     // Init effects
-    antialias.setLowpass(0, 6000, 0.707);
-    filter1.frequency(EXP_FUNC((float)map(effect_filter_frq, 0, ENC_FILTER_FRQ_STEPS, 0, 1024) / 150.0) * 10.0 + 80.0);
-    //filter1.resonance(mapfloat(effect_filter_resonance, 0, ENC_FILTER_RES_STEPS, 0.7, 5.0));
-    filter1.resonance(EXP_FUNC(mapfloat(effect_filter_resonance, 0, ENC_FILTER_RES_STEPS, 0.7, 5.0)) * 0.044 + 0.61);
-    filter1.octaveControl(mapfloat(effect_filter_octave, 0, ENC_FILTER_OCT_STEPS, 0.0, 7.0));
     delay1.delay(0, mapfloat(effect_delay_feedback, 0, ENC_DELAY_TIME_STEPS, 0.0, DELAY_MAX_TIME));
     // mixer1 is the feedback-adding mixer, mixer2 the whole delay (with/without feedback) mixer
     mixer1.gain(0, 1.0); // original signal
     mixer1.gain(1, mapfloat(effect_delay_feedback, 0, ENC_DELAY_FB_STEPS, 0.0, 1.0)); // amount of feedback
-    mixer1.gain(0, 0.0); // filtered signal off
-    mixer1.gain(3, 1.0); // original signal on
     mixer2.gain(0, 1.0 - mapfloat(effect_delay_volume, 0, ENC_DELAY_VOLUME_STEPS, 0.0, 1.0)); // original signal
     mixer2.gain(1, mapfloat(effect_delay_volume, 0, ENC_DELAY_VOLUME_STEPS, 0.0, 1.0)); // delayed signal (including feedback)
     mixer2.gain(2, mapfloat(effect_delay_volume, 0, ENC_DELAY_VOLUME_STEPS, 0.0, 1.0)); // only delayed signal (without feedback)
+    dexed->fx.Gain =  1.0;
+    dexed->fx.Reso = 1.0 - float(effect_filter_resonance) / ENC_FILTER_RES_STEPS;
+    dexed->fx.Cutoff = 1.0 - float(effect_filter_cutoff) / ENC_FILTER_CUT_STEPS;
 
     // load default SYSEX data
-    load_sysex(bank, voice);
+    load_sysex(configuration.bank, configuration.voice);
   }
 
 #ifdef I2C_DISPLAY
-  enc[0].write(map(vol * 100, 0, 100, 0, ENC_VOL_STEPS));
+  enc[0].write(map(configuration.vol * 100, 0, 100, 0, ENC_VOL_STEPS));
   enc_val[0] = enc[0].read();
-  enc[1].write(voice);
+  enc[1].write(configuration.voice);
   enc_val[1] = enc[1].read();
   but[0].update();
   but[1].update();
@@ -269,9 +250,9 @@ void setup()
 
 #ifdef DEBUG
   Serial.print(F("Bank/Voice from EEPROM ["));
-  Serial.print(EEPROM.read(EEPROM_OFFSET + EEPROM_BANK_ADDR), DEC);
+  Serial.print(configuration.bank, DEC);
   Serial.print(F("/"));
-  Serial.print(EEPROM.read(EEPROM_OFFSET +  EEPROM_VOICE_ADDR), DEC);
+  Serial.print(configuration.voice, DEC);
   Serial.println(F("]"));
   show_patch();
 #endif
@@ -320,23 +301,32 @@ void loop()
     }
 #ifndef TEENSY_AUDIO_BOARD
     for (uint8_t i = 0; i < AUDIO_BLOCK_SAMPLES; i++)
-      audio_buffer[i] *= vol;
+      audio_buffer[i] *= configuration.vol;
 #endif
     queue1.playBuffer();
   }
 
   // EEPROM update handling
-  if (eeprom_update_status > 0 && autostore >= autostore_value)
+  if (autostore >= AUTOSTORE_MS && active_voices == 0 && eeprom_update_flag == true)
   {
-    autostore = 0;
+    // only store configuration data to EEPROM when AUTOSTORE_MS is reached and no voices are activated anymore
     eeprom_update();
   }
 
   // MIDI input handling
   check_midi_devices();
 
+  // CONTROL-RATE-EVENT-HANDLING
+  if (control_rate > CONTROL_RATE_MS)
+  {
+    control_rate = 0;
+
+    // Shutdown unused voices
+    active_voices = dexed->getNumNotesPlaying();
+  }
+
 #ifdef I2C_DISPLAY
-  // UI
+  // UI-HANDLING
   if (master_timer >= TIMER_UI_HANDLING_MS)
   {
     master_timer -= TIMER_UI_HANDLING_MS;
@@ -388,7 +378,7 @@ void handleControlChange(byte inChannel, byte inCtrl, byte inValue)
       case 0:
         if (inValue < MAX_BANKS)
         {
-          bank = inValue;
+          configuration.bank = inValue;
           handle_ui();
         }
         break;
@@ -405,15 +395,15 @@ void handleControlChange(byte inChannel, byte inCtrl, byte inValue)
         dexed->controllers.refresh();
         break;
       case 7: // Volume
-        vol = float(inValue) / 0x7f;
-        set_volume(vol, pan);
+        configuration.vol = float(inValue) / 0x7f;
+        set_volume(configuration.vol, configuration.pan);
         break;
       case 10: // Pan
-        pan = float(inValue) / 128;
-        set_volume(vol, pan);
+        configuration.pan = float(inValue) / 128;
+        set_volume(configuration.vol, configuration.pan);
         break;
       case 32: // BankSelect LSB
-        bank = inValue;
+        configuration.bank = inValue;
         break;
       case 64:
         dexed->setSustain(inValue > 63);
@@ -426,31 +416,14 @@ void handleControlChange(byte inChannel, byte inCtrl, byte inValue)
           }
         }
         break;
-      case 102:  // CC 102: filter frequency
-        effect_filter_frq = map(inValue, 0, 127, 0, ENC_FILTER_FRQ_STEPS);
-        if (effect_filter_frq == ENC_FILTER_FRQ_STEPS)
-        {
-          // turn "off" filter
-          mixer1.gain(0, 0.0); // filtered signal off
-          mixer1.gain(3, 1.0); // original signal on
-        }
-        else
-        {
-          // turn "on" filter
-          mixer1.gain(0, 1.0); // filtered signal on
-          mixer1.gain(3, 0.0); // original signal off
-        }
-        filter1.frequency(EXP_FUNC((float)map(effect_filter_frq, 0, ENC_FILTER_FRQ_STEPS, 0, 1024) / 150.0) * 10.0 + 80.0);
-        handle_ui();
-        break;
       case 103:  // CC 103: filter resonance
         effect_filter_resonance = map(inValue, 0, 127, 0, ENC_FILTER_RES_STEPS);
-        filter1.resonance(EXP_FUNC(mapfloat(effect_filter_resonance, 0, ENC_FILTER_RES_STEPS, 0.7, 5.0)) * 0.044 + 0.61);
+        dexed->fx.Reso = 1.0 - float(effect_filter_resonance) / ENC_FILTER_RES_STEPS;
         handle_ui();
         break;
-      case 104:  // CC 104: filter octave
-        effect_filter_octave = map(inValue, 0, 127, 0, ENC_FILTER_OCT_STEPS);
-        filter1.octaveControl(mapfloat(effect_filter_octave, 0, ENC_FILTER_OCT_STEPS, 0.0, 7.0));
+      case 104:  // CC 104: filter cutoff
+        effect_filter_cutoff = map(inValue, 0, 127, 0, ENC_FILTER_CUT_STEPS);
+        dexed->fx.Cutoff = 1.0 - float(effect_filter_cutoff) / ENC_FILTER_CUT_STEPS;
         handle_ui();
         break;
       case 105:  // CC 105: delay time
@@ -502,12 +475,12 @@ void handleProgramChange(byte inChannel, byte inProgram)
 {
   if (inProgram < MAX_VOICES)
   {
-    load_sysex(bank, inProgram);
+    load_sysex(configuration.bank, inProgram);
     handle_ui();
   }
 }
 
-void handleSystemExclusive(byte *sysex, uint len)
+void handleSystemExclusive(byte * sysex, uint len)
 {
   /*
     SYSEX MESSAGE: Parameter Change
@@ -617,7 +590,7 @@ void handleSystemExclusive(byte *sysex, uint len)
     Serial.print(F(" = "));
     Serial.print(sysex[5], DEC);
     Serial.print(F(", data_index = "));
-    Serial.println(data_index,DEC);
+    Serial.println(data_index, DEC);
 #endif
   }
 #ifdef DEBUG
@@ -696,23 +669,23 @@ void handleSystemReset(void)
 }
 
 /******************************************************************************
-   END OF MIDI MESSAGE HANDLER
+   MIDI HELPER
  ******************************************************************************/
 
 bool checkMidiChannel(byte inChannel)
 {
   // check for MIDI channel
-  if (midi_channel == MIDI_CHANNEL_OMNI)
+  if (configuration.midi_channel == MIDI_CHANNEL_OMNI)
   {
     return (true);
   }
-  else if (inChannel != midi_channel)
+  else if (inChannel != configuration.midi_channel)
   {
 #ifdef DEBUG
     Serial.print(F("Ignoring MIDI data on channel "));
     Serial.print(inChannel);
     Serial.print(F("(listening on "));
-    Serial.print(midi_channel);
+    Serial.print(configuration.midi_channel);
     Serial.println(F(")"));
 #endif
     return (false);
@@ -720,30 +693,27 @@ bool checkMidiChannel(byte inChannel)
   return (true);
 }
 
+/******************************************************************************
+   VOLUME HELPER
+ ******************************************************************************/
+
 void set_volume(float v, float p)
 {
-  vol = v;
-  pan = p;
+  configuration.vol = v;
+  configuration.pan = p;
 
 #ifdef DEBUG
-  uint8_t tmp;
   Serial.print(F("Setting volume: VOL="));
   Serial.print(v, DEC);
   Serial.print(F("["));
-  tmp = EEPROM.read(EEPROM_OFFSET + EEPROM_MASTER_VOLUME_ADDR);
-  Serial.print(tmp, DEC);
-  Serial.print(F("/"));
-  Serial.print(float(tmp) / UCHAR_MAX, DEC);
+  Serial.print(configuration.vol, DEC);
   Serial.print(F("] PAN="));
   Serial.print(F("["));
-  tmp = EEPROM.read(EEPROM_OFFSET + EEPROM_PAN_ADDR);
-  Serial.print(tmp, DEC);
-  Serial.print(F("/"));
-  Serial.print(float(tmp) / SCHAR_MAX, DEC);
+  Serial.print(configuration.pan, DEC);
   Serial.print(F("] "));
-  Serial.print(pow(v * sinf(p * PI / 2), VOLUME_CURVE), 3);
+  Serial.print(pow(configuration.vol * sinf(configuration.pan * PI / 2), VOLUME_CURVE), 3);
   Serial.print(F("/"));
-  Serial.println(pow(v * cosf(p * PI / 2), VOLUME_CURVE), 3);
+  Serial.println(pow(configuration.vol * cosf( configuration.pan * PI / 2), VOLUME_CURVE), 3);
 #endif
 
   // http://files.csound-tutorial.net/floss_manual/Release03/Cs_FM_03_ScrapBook/b-panning-and-spatialization.html
@@ -762,58 +732,58 @@ inline float logvol(float x)
   return (0.001 * expf(6.908 * x));
 }
 
+
+/******************************************************************************
+   EEPROM HELPER
+ ******************************************************************************/
+
 void initial_values_from_eeprom(void)
 {
-  uint32_t crc_eeprom = read_eeprom_checksum();
-  uint32_t crc = eeprom_crc32(EEPROM_OFFSET, EEPROM_DATA_LENGTH);
+  uint32_t checksum;
+  config_t tmp_conf;
+
+  EEPROM_readAnything(EEPROM_START_ADDRESS, tmp_conf);
+  checksum = crc32((byte*)&tmp_conf + 4, sizeof(tmp_conf) - 4);
 
 #ifdef DEBUG
   Serial.print(F("EEPROM checksum: 0x"));
-  Serial.print(crc_eeprom, HEX);
+  Serial.print(tmp_conf.checksum, HEX);
   Serial.print(F(" / 0x"));
-  Serial.print(crc, HEX);
+  Serial.print(checksum, HEX);
 #endif
-  if (crc_eeprom != crc)
+
+  if (checksum != tmp_conf.checksum)
   {
 #ifdef DEBUG
     Serial.print(F(" - mismatch -> initializing EEPROM!"));
 #endif
-    eeprom_write(EEPROM_UPDATE_BANK + EEPROM_UPDATE_VOICE + EEPROM_UPDATE_VOL + EEPROM_UPDATE_PAN + EEPROM_UPDATE_MIDICHANNEL);
+    eeprom_update();
   }
   else
   {
-    bank = EEPROM.read(EEPROM_OFFSET + EEPROM_BANK_ADDR);
-    voice = EEPROM.read(EEPROM_OFFSET + EEPROM_VOICE_ADDR);
-    vol = float(EEPROM.read(EEPROM_OFFSET + EEPROM_MASTER_VOLUME_ADDR)) / UCHAR_MAX;
-    pan = float(EEPROM.read(EEPROM_OFFSET + EEPROM_PAN_ADDR)) / SCHAR_MAX;
-    midi_channel = EEPROM.read(EEPROM_OFFSET + EEPROM_MIDICHANNEL_ADDR);
-    if (midi_channel > 16)
-      midi_channel = MIDI_CHANNEL_OMNI;
+    EEPROM_readAnything(EEPROM_START_ADDRESS, configuration);
+    Serial.print(F(" - OK, loading!"));
   }
 #ifdef DEBUG
   Serial.println();
 #endif
 }
 
-uint32_t read_eeprom_checksum(void)
-{
-  return (EEPROM.read(EEPROM_CRC32_ADDR) << 24 | EEPROM.read(EEPROM_CRC32_ADDR + 1) << 16 | EEPROM.read(EEPROM_CRC32_ADDR + 2) << 8 | EEPROM.read(EEPROM_CRC32_ADDR + 3));
-}
-
-void update_eeprom_checksum(void)
+void eeprom_write(void)
 {
-  write_eeprom_checksum(eeprom_crc32(EEPROM_OFFSET, EEPROM_DATA_LENGTH)); // recalculate crc and write to eeprom
+  autostore = 0;
+  eeprom_update_flag = true;
 }
 
-void write_eeprom_checksum(uint32_t crc)
+void eeprom_update(void)
 {
-  EEPROM.update(EEPROM_CRC32_ADDR, (crc & 0xff000000) >> 24);
-  EEPROM.update(EEPROM_CRC32_ADDR + 1, (crc & 0x00ff0000) >> 16);
-  EEPROM.update(EEPROM_CRC32_ADDR + 2, (crc & 0x0000ff00) >> 8);
-  EEPROM.update(EEPROM_CRC32_ADDR + 3, crc & 0x000000ff);
+  eeprom_update_flag = false;
+  configuration.checksum = crc32((byte*)&configuration + 4, sizeof(configuration) - 4);
+  EEPROM_writeAnything(EEPROM_START_ADDRESS, configuration);
+  Serial.println(F("Updating EEPROM with configuration data"));
 }
 
-uint32_t eeprom_crc32(uint16_t calc_start, uint16_t calc_bytes) // base code from https://www.arduino.cc/en/Tutorial/EEPROMCrc
+uint32_t crc32(byte * calc_start, uint16_t calc_bytes) // base code from https://www.arduino.cc/en/Tutorial/EEPROMCrc
 {
   const uint32_t crc_table[16] =
   {
@@ -824,97 +794,19 @@ uint32_t eeprom_crc32(uint16_t calc_start, uint16_t calc_bytes) // base code fro
   };
   uint32_t crc = ~0L;
 
-  if (calc_start + calc_bytes > EEPROM.length())
-    calc_bytes = EEPROM.length() - calc_start;
-
-  for (uint16_t index = calc_start ; index < (calc_start + calc_bytes) ; ++index)
+  for (byte* index = calc_start ; index < (calc_start + calc_bytes) ; ++index)
   {
-    crc = crc_table[(crc ^ EEPROM[index]) & 0x0f] ^ (crc >> 4);
-    crc = crc_table[(crc ^ (EEPROM[index] >> 4)) & 0x0f] ^ (crc >> 4);
+    crc = crc_table[(crc ^ *index) & 0x0f] ^ (crc >> 4);
+    crc = crc_table[(crc ^ (*index >> 4)) & 0x0f] ^ (crc >> 4);
     crc = ~crc;
   }
 
   return (crc);
 }
 
-void eeprom_write(uint8_t status)
-{
-  eeprom_update_status |= status;
-  if (eeprom_update_status != 0)
-    autostore = 0;
-#ifdef DEBUG
-  Serial.print(F("Updating EEPROM state to: "));
-  Serial.println(eeprom_update_status, DEC);
-#endif
-}
-
-void eeprom_update(void)
-{
-  autostore_value = AUTOSTORE_FAST_MS;
-
-  if (eeprom_update_status & EEPROM_UPDATE_BANK)
-  {
-    EEPROM.update(EEPROM_OFFSET + EEPROM_BANK_ADDR, bank);
-#ifdef DEBUG
-    Serial.println(F("Bank written to EEPROM"));
-#endif
-    eeprom_update_status &= ~EEPROM_UPDATE_BANK;
-  }
-  else if (eeprom_update_status & EEPROM_UPDATE_VOICE)
-  {
-    EEPROM.update(EEPROM_OFFSET + EEPROM_VOICE_ADDR, voice);
-#ifdef DEBUG
-    Serial.println(F("Voice written to EEPROM"));
-#endif
-    eeprom_update_status &= ~EEPROM_UPDATE_VOICE;
-  }
-  else if (eeprom_update_status & EEPROM_UPDATE_VOL)
-  {
-    EEPROM.update(EEPROM_OFFSET + EEPROM_MASTER_VOLUME_ADDR, uint8_t(vol * UCHAR_MAX));
-#ifdef DEBUG
-    Serial.println(F("Volume written to EEPROM"));
-#endif
-    eeprom_update_status &= ~EEPROM_UPDATE_VOL;
-  }
-  else if (eeprom_update_status & EEPROM_UPDATE_PAN)
-  {
-    EEPROM.update(EEPROM_OFFSET + EEPROM_PAN_ADDR, uint8_t(pan * SCHAR_MAX));
-#ifdef DEBUG
-    Serial.println(F("Panorama written to EEPROM"));
-#endif
-    eeprom_update_status &= ~EEPROM_UPDATE_PAN;
-  }
-  else if (eeprom_update_status & EEPROM_UPDATE_MIDICHANNEL )
-  {
-    EEPROM.update(EEPROM_OFFSET + EEPROM_MIDICHANNEL_ADDR, midi_channel);
-    update_eeprom_checksum();
-#ifdef DEBUG
-    Serial.println(F("MIDI channel written to EEPROM"));
-#endif
-    eeprom_update_status &= ~EEPROM_UPDATE_MIDICHANNEL;
-  }
-  else if (eeprom_update_status & EEPROM_UPDATE_CHECKSUM)
-  {
-    update_eeprom_checksum();
-#ifdef DEBUG
-    Serial.println(F("Checksum written to EEPROM"));
-#endif
-    eeprom_update_status &= ~EEPROM_UPDATE_CHECKSUM;
-    autostore_value = AUTOSTORE_MS;
-    return;
-  }
-
-  if (eeprom_update_status == 0)
-    eeprom_update_status |= EEPROM_UPDATE_CHECKSUM;
-}
-
-void init_eeprom(void)
-{
-  for (uint8_t i = 0; i < EEPROM_DATA_LENGTH; i++)
-  {
-    EEPROM.update(EEPROM_OFFSET + i, 0);
-  }
-}
+/******************************************************************************
+   DEBUG HELPER
+ ******************************************************************************/
 
 #if defined (DEBUG) && defined (SHOW_CPU_LOAD_MSEC)
 void show_cpu_and_mem_usage(void)
@@ -937,6 +829,8 @@ void show_cpu_and_mem_usage(void)
   Serial.print(peak, DEC);
   Serial.print(F(" BLOCKSIZE: "));
   Serial.print(AUDIO_BLOCK_SAMPLES, DEC);
+  Serial.print(F(" ACTIVE_VOICES: "));
+  Serial.print(active_voices, DEC);
   Serial.println();
   AudioProcessorUsageMaxReset();
   AudioMemoryUsageMaxReset();
diff --git a/PluginFx.cpp b/PluginFx.cpp
new file mode 100644
index 0000000..2616ffd
--- /dev/null
+++ b/PluginFx.cpp
@@ -0,0 +1,216 @@
+/**
+
+   Copyright (c) 2013-2014 Pascal Gauthier.
+   Copyright (c) 2013-2014 Filatov Vadim.
+
+   Filter taken from the Obxd project :
+     https://github.com/2DaT/Obxd
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software Foundation,
+   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301  USA
+
+*/
+
+#define _USE_MATH_DEFINES
+#include <math.h>
+#include "PluginFx.h"
+
+const float dc = 1e-18;
+
+inline static float tptpc(float& state, float inp, float cutoff) {
+  float v = (inp - state) * cutoff / (1 + cutoff);
+  float res = v + state;
+  state = res + v;
+  return res;
+}
+
+inline static float tptlpupw(float & state , float inp , float cutoff , float srInv) {
+  cutoff = (cutoff * srInv) * M_PI;
+  float v = (inp - state) * cutoff / (1 + cutoff);
+  float res = v + state;
+  state = res + v;
+  return res;
+}
+
+//static float linsc(float param,const float min,const float max) {
+//    return (param) * (max - min) + min;
+//}
+
+static float logsc(float param, const float min, const float max, const float rolloff = 19.0f) {
+  return ((expf(param * logf(rolloff + 1)) - 1.0f) / (rolloff)) * (max - min) + min;
+}
+
+PluginFx::PluginFx() {
+  Cutoff = 1;
+  Reso = 0;
+  Gain = 1;
+}
+
+void PluginFx::init(int sr) {
+  mm = 0;
+  s1 = s2 = s3 = s4 = c = d = 0;
+  R24 = 0;
+
+  mmch = (int)(mm * 3);
+  mmt = mm * 3 - mmch;
+
+  sampleRate = sr;
+  sampleRateInv = 1 / sampleRate;
+  float rcrate = sqrt((44000 / sampleRate));
+  rcor24 = (970.0 / 44000) * rcrate;
+  rcor24Inv = 1 / rcor24;
+
+  bright = tanf((sampleRate * 0.5f - 10) * M_PI * sampleRateInv);
+
+  R = 1;
+  rcor = (480.0 / 44000) * rcrate;
+  rcorInv = 1 / rcor;
+  bandPassSw = false;
+
+  pCutoff = -1;
+  pReso = -1;
+
+  dc_r = 1.0 - (126.0 / sr);
+  dc_id = 0;
+  dc_od = 0;
+}
+
+inline float PluginFx::NR24(float sample, float g, float lpc) {
+  float ml = 1 / (1 + g);
+  float S = (lpc * (lpc * (lpc * s1 + s2) + s3) + s4) * ml;
+  float G = lpc * lpc * lpc * lpc;
+  float y = (sample - R24 * S) / (1 + R24 * G);
+  return y + 1e-8;
+};
+
+inline float PluginFx::NR(float sample, float g) {
+  float y = ((sample - R * s1 * 2 - g * s1  - s2) / (1 + g * (2 * R + g))) + dc;
+  return y;
+}
+
+void PluginFx::process(float *work, int sampleSize) {
+  // very basic DC filter
+  float t_fd = work[0];
+  work[0] = work[0] - dc_id + dc_r * dc_od;
+  dc_id = t_fd;
+  for (int i = 1; i < sampleSize; i++) {
+    t_fd = work[i];
+    work[i] = work[i] - dc_id + dc_r * work[i - 1];
+    dc_id = t_fd;
+
+  }
+  dc_od = work[sampleSize - 1];
+
+  if ( Gain != 1 ) {
+    for (int i = 0; i < sampleSize; i++ )
+      work[i] *= Gain;
+  }
+
+  // don't apply the LPF if the cutoff is to maximum
+  if ( Cutoff == 1 )
+    return;
+
+  if ( Cutoff != pCutoff || Reso != pReso ) {
+    rReso = (0.991 - logsc(1 - Reso, 0, 0.991));
+    R24 = 3.5 * rReso;
+
+    float cutoffNorm = logsc(Cutoff, 60, 19000);
+    rCutoff = (float)tanf(cutoffNorm * sampleRateInv * M_PI);
+
+    pCutoff = Cutoff;
+    pReso = Reso;
+
+    R = 1 - rReso;
+  }
+
+  // THIS IS MY FAVORITE 4POLE OBXd filter
+
+  // maybe smooth this value
+  float g = rCutoff;
+  float lpc = g / (1 + g);
+
+  for (int i = 0; i < sampleSize; i++ ) {
+    float s = work[i];
+    s = s - 0.45 * tptlpupw(c, s, 15, sampleRateInv);
+    s = tptpc(d, s, bright);
+
+    float y0 = NR24(s, g, lpc);
+
+    //first low pass in cascade
+    float v = (y0 - s1) * lpc;
+    float res = v + s1;
+    s1 = res + v;
+
+    //damping
+    s1 = atanf(s1 * rcor24) * rcor24Inv;
+    float y1 = res;
+    float y2 = tptpc(s2, y1, g);
+    float y3 = tptpc(s3, y2, g);
+    float y4 = tptpc(s4, y3, g);
+    float mc = 0.0;
+
+    switch (mmch) {
+      case 0:
+        mc = ((1 - mmt) * y4 + (mmt) * y3);
+        break;
+      case 1:
+        mc = ((1 - mmt) * y3 + (mmt) * y2);
+        break;
+      case 2:
+        mc = ((1 - mmt) * y2 + (mmt) * y1);
+        break;
+      case 3:
+        mc = y1;
+        break;
+    }
+
+    //half volume comp
+    work[i] = mc * (1 + R24 * 0.45);
+  }
+}
+
+/*
+
+  // THIS IS THE 2POLE FILTER
+
+  for(int i=0; i < sampleSize; i++ ) {
+  float s = work[i];
+  s = s - 0.45*tptlpupw(c,s,15,sampleRateInv);
+  s = tptpc(d,s,bright);
+
+  //float v = ((sample- R * s1*2 - g2*s1 - s2)/(1+ R*g1*2 + g1*g2));
+  float v = NR(s,g);
+  float y1 = v*g + s1;
+  //damping
+  s1 = atanf(s1 * rcor) * rcorInv;
+
+  float y2 = y1*g + s2;
+  s2 = y2 + y1*g;
+
+  float mc;
+  if(!bandPassSw)
+  mc = (1-mm)*y2 + (mm)*v;
+  else
+  {
+
+  mc =2 * ( mm < 0.5 ?
+  ((0.5 - mm) * y2 + (mm) * y1):
+  ((1-mm) * y1 + (mm-0.5) * v)
+  );
+  }
+
+  work[i] = mc;
+  }
+
+*/
diff --git a/PluginFx.h b/PluginFx.h
new file mode 100644
index 0000000..7946493
--- /dev/null
+++ b/PluginFx.h
@@ -0,0 +1,72 @@
+/**
+
+   Copyright (c) 2013 Pascal Gauthier.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software Foundation,
+   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301  USA
+
+*/
+
+#ifndef PLUGINFX_H_INCLUDED
+#define PLUGINFX_H_INCLUDED
+
+class PluginFx {
+    float s1, s2, s3, s4;
+    float sampleRate;
+    float sampleRateInv;
+    float d, c;
+    float R24;
+    float rcor24, rcor24Inv;
+    float bright;
+
+    // 24 db multimode
+    float mm;
+    float mmt;
+    int mmch;
+    inline float NR24(float sample, float g, float lpc);
+
+    // preprocess values taken the UI
+    float rCutoff;
+    float rReso;
+    float rGain;
+
+    // thread values; if these are different from the UI,
+    // it needs to be recalculated.
+    float pReso;
+    float pCutoff;
+    float pGain;
+
+    // I am still keeping the 2pole w/multimode filter
+    inline float NR(float sample, float g);
+    bool bandPassSw;
+    float rcor, rcorInv;
+    int R;
+
+    float dc_id;
+    float dc_od;
+    float dc_r;
+
+  public:
+    PluginFx();
+
+    // this is set directly by the ui / parameter
+    float Cutoff;
+    float Reso;
+    float Gain;
+
+    void init(int sampleRate);
+    void process(float *work, int sampleSize);
+};
+
+#endif  // PLUGINFX_H_INCLUDED
diff --git a/UI.cpp b/UI.cpp
index 64cfaca..da81939 100644
--- a/UI.cpp
+++ b/UI.cpp
@@ -38,7 +38,7 @@ void handle_ui(void)
 {
   if (ui_back_to_main >= UI_AUTO_BACK_MS && (ui_state != UI_MAIN && ui_state != UI_EFFECTS_FILTER && ui_state != UI_EFFECTS_DELAY))
   {
-    enc[0].write(map(vol * 100, 0, 100, 0, ENC_VOL_STEPS));
+    enc[0].write(map(configuration.vol * 100, 0, 100, 0, ENC_VOL_STEPS));
     enc_val[0] = enc[0].read();
     ui_show_main();
   }
@@ -84,8 +84,8 @@ void handle_ui(void)
             switch (ui_state)
             {
               case UI_MAIN:
-                ui_main_state = UI_MAIN_FILTER_FRQ;
-                enc[i].write(effect_filter_frq);
+                ui_main_state = UI_MAIN_FILTER_RES;
+                enc[i].write(effect_filter_resonance);
                 enc_val[i] = enc[i].read();
                 ui_show_effects_filter();
                 break;
@@ -97,7 +97,7 @@ void handle_ui(void)
                 break;
               case UI_EFFECTS_DELAY:
                 ui_main_state = UI_MAIN_VOICE;
-                enc[i].write(voice);
+                enc[i].write(configuration.voice);
                 enc_val[i] = enc[i].read();
                 ui_show_main();
                 break;
@@ -114,17 +114,17 @@ void handle_ui(void)
             switch (ui_state)
             {
               case UI_MAIN:
-                enc[i].write(map(vol * 100, 0, 100, 0, ENC_VOL_STEPS));
+                enc[i].write(map(configuration.vol * 100, 0, 100, 0, ENC_VOL_STEPS));
                 enc_val[i] = enc[i].read();
                 ui_show_volume();
                 break;
               case UI_VOLUME:
-                enc[i].write(midi_channel);
+                enc[i].write(configuration.midi_channel);
                 enc_val[i] = enc[i].read();
                 ui_show_midichannel();
                 break;
               case UI_MIDICHANNEL:
-                enc[i].write(map(vol * 100, 0, 100, 0, ENC_VOL_STEPS));
+                enc[i].write(map(configuration.vol * 100, 0, 100, 0, ENC_VOL_STEPS));
                 enc_val[i] = enc[i].read();
                 ui_show_main();
                 break;
@@ -139,13 +139,13 @@ void handle_ui(void)
                   case UI_MAIN_BANK:
                   case UI_MAIN_BANK_SELECTED:
                     ui_main_state = UI_MAIN_VOICE;
-                    enc[i].write(voice);
+                    enc[i].write(configuration.voice);
                     enc_val[i] = enc[i].read();
                     break;
                   case UI_MAIN_VOICE:
                   case UI_MAIN_VOICE_SELECTED:
                     ui_main_state = UI_MAIN_BANK;
-                    enc[i].write(bank);
+                    enc[i].write(configuration.bank);
                     enc_val[i] = enc[i].read();
                     break;
                 }
@@ -155,21 +155,15 @@ void handle_ui(void)
               case UI_EFFECTS_DELAY:
                 switch (ui_main_state)
                 {
-                  case UI_MAIN_FILTER_FRQ:
-                    ui_main_state = UI_MAIN_FILTER_RES;
-                    enc[i].write(effect_filter_resonance);
-                    enc_val[i] = enc[i].read();
-                    ui_show_effects_filter();
-                    break;
                   case UI_MAIN_FILTER_RES:
-                    ui_main_state = UI_MAIN_FILTER_OCT;
-                    enc[i].write(effect_filter_octave);
+                    ui_main_state = UI_MAIN_FILTER_CUT;
+                    enc[i].write(effect_filter_cutoff);
                     enc_val[i] = enc[i].read();
                     ui_show_effects_filter();
                     break;
-                  case UI_MAIN_FILTER_OCT:
-                    ui_main_state = UI_MAIN_FILTER_FRQ;
-                    enc[i].write(effect_filter_frq);
+                  case UI_MAIN_FILTER_CUT:
+                    ui_main_state = UI_MAIN_FILTER_RES;
+                    enc[i].write(effect_filter_resonance);
                     enc_val[i] = enc[i].read();
                     ui_show_effects_filter();
                     break;
@@ -217,8 +211,8 @@ void handle_ui(void)
                 enc[i].write(0);
               else if (enc[i].read() >= ENC_VOL_STEPS)
                 enc[i].write(ENC_VOL_STEPS);
-              set_volume(float(map(enc[i].read(), 0, ENC_VOL_STEPS, 0, 100)) / 100, pan);
-              eeprom_write(EEPROM_UPDATE_VOL);
+              set_volume(float(map(enc[i].read(), 0, ENC_VOL_STEPS, 0, 100)) / 100, configuration.pan);
+              eeprom_write();
               ui_show_volume();
               break;
             case UI_MIDICHANNEL:
@@ -226,8 +220,8 @@ void handle_ui(void)
                 enc[i].write(0);
               else if (enc[i].read() >= 16)
                 enc[i].write(16);
-              midi_channel = enc[i].read();
-              eeprom_write(EEPROM_UPDATE_MIDICHANNEL);
+              configuration.midi_channel = enc[i].read();
+              eeprom_write();
               ui_show_midichannel();
               break;
           }
@@ -235,6 +229,12 @@ void handle_ui(void)
         case 1: // right encoder moved
           switch (ui_state)
           {
+            case UI_VOLUME:
+              ui_state = UI_MAIN;
+              lcd.clear();
+              enc[1].write(configuration.voice);
+              ui_show_main();
+              break;
             case UI_MAIN:
               switch (ui_main_state)
               {
@@ -245,39 +245,39 @@ void handle_ui(void)
                     enc[i].write(0);
                   else if (enc[i].read() > max_loaded_banks - 1)
                     enc[i].write(max_loaded_banks - 1);
-                  bank = enc[i].read();
-                  get_voice_names_from_bank(bank);
-                  load_sysex(bank, voice);
-                  eeprom_write(EEPROM_UPDATE_BANK);
+                  configuration.bank = enc[i].read();
+                  get_voice_names_from_bank(configuration.bank);
+                  load_sysex(configuration.bank, configuration.voice);
+                  eeprom_write();
                   break;
                 case UI_MAIN_VOICE:
                   ui_main_state = UI_MAIN_VOICE_SELECTED;
                 case UI_MAIN_VOICE_SELECTED:
                   if (enc[i].read() <= 0)
                   {
-                    if (bank > 0)
+                    if (configuration.bank > 0)
                     {
                       enc[i].write(MAX_VOICES - 1);
-                      bank--;
-                      get_voice_names_from_bank(bank);
+                      configuration.bank--;
+                      get_voice_names_from_bank(configuration.bank);
                     }
                     else
                       enc[i].write(0);
                   }
                   else if (enc[i].read() > MAX_VOICES - 1)
                   {
-                    if (bank < MAX_BANKS - 1)
+                    if (configuration.bank < MAX_BANKS - 1)
                     {
                       enc[i].write(0);
-                      bank++;
-                      get_voice_names_from_bank(bank);
+                      configuration.bank++;
+                      get_voice_names_from_bank(configuration.bank);
                     }
                     else
                       enc[i].write(MAX_VOICES - 1);
                   }
-                  voice = enc[i].read();
-                  load_sysex(bank, voice);
-                  eeprom_write(EEPROM_UPDATE_VOICE);
+                  configuration.voice = enc[i].read();
+                  load_sysex(configuration.bank, configuration.voice);
+                  eeprom_write();
                   break;
               }
               ui_show_main();
@@ -285,54 +285,28 @@ void handle_ui(void)
             case UI_EFFECTS_FILTER:
               switch (ui_main_state)
               {
-                case UI_MAIN_FILTER_FRQ:
-                  if (enc[i].read() <= 0)
-                    enc[i].write(0);
-                  else if (enc[i].read() > ENC_FILTER_FRQ_STEPS)
-                    enc[i].write(ENC_FILTER_FRQ_STEPS);
-                  effect_filter_frq = enc[i].read();
-                  if (effect_filter_frq == ENC_FILTER_FRQ_STEPS)
-                  {
-                    // turn "off" filter
-                    mixer1.gain(0, 0.0); // filtered signal off
-                    mixer1.gain(3, 1.0); // original signal on
-                  }
-                  else
-                  {
-                    // turn "on" filter
-                    mixer1.gain(0, 1.0); // filtered signal on
-                    mixer1.gain(3, 0.0); // original signal off
-                  }
-                  filter1.frequency(EXP_FUNC((float)map(effect_filter_frq, 0, ENC_FILTER_FRQ_STEPS, 0, 1024) / 150.0) * 10.0 + 80.0);
-#ifdef DEBUG
-                  Serial.print(F("Setting filter frequency to: "));
-                  Serial.println(EXP_FUNC((float)map(effect_filter_frq, 0, ENC_FILTER_FRQ_STEPS, 0, 1024) / 150.0) * 10.0 + 80.0, DEC);
-#endif
-                  break;
                 case UI_MAIN_FILTER_RES:
                   if (enc[i].read() <= 0)
                     enc[i].write(0);
                   else if (enc[i].read() > ENC_FILTER_RES_STEPS)
                     enc[i].write(ENC_FILTER_RES_STEPS);
                   effect_filter_resonance = enc[i].read();
-                  //filter1.resonance(mapfloat(effect_filter_resonance, 0, ENC_FILTER_RES_STEPS, 0.7, 5.0));
-                  filter1.resonance(EXP_FUNC(mapfloat(effect_filter_resonance, 0, ENC_FILTER_RES_STEPS, 0.7, 5.0)) * 0.044 + 0.61);
-
+                  dexed->fx.Reso = 1.0 - float(effect_filter_resonance) / ENC_FILTER_RES_STEPS;
 #ifdef DEBUG
                   Serial.print(F("Setting filter resonance to: "));
-                  Serial.println(EXP_FUNC(mapfloat(effect_filter_resonance, 0, ENC_FILTER_RES_STEPS, 0.7, 5.0)) * 0.044 + 0.61, 2);
+                  Serial.println(1.0 - float(effect_filter_resonance) / ENC_FILTER_RES_STEPS, 5);
 #endif
                   break;
-                case UI_MAIN_FILTER_OCT:
+                case UI_MAIN_FILTER_CUT:
                   if (enc[i].read() <= 0)
                     enc[i].write(0);
-                  else if (enc[i].read() > ENC_FILTER_OCT_STEPS)
-                    enc[i].write(ENC_FILTER_OCT_STEPS);
-                  effect_filter_octave = enc[i].read();
-                  filter1.octaveControl(mapfloat(effect_filter_octave, 0, ENC_FILTER_OCT_STEPS, 0.0, 7.0));
+                  else if (enc[i].read() > ENC_FILTER_CUT_STEPS)
+                    enc[i].write(ENC_FILTER_CUT_STEPS);
+                  effect_filter_cutoff = enc[i].read();
+                  dexed->fx.Cutoff = 1.0 - float(effect_filter_cutoff) / ENC_FILTER_CUT_STEPS;
 #ifdef DEBUG
-                  Serial.print(F("Setting filter octave control to: "));
-                  Serial.println(mapfloat(effect_filter_octave, 0, ENC_FILTER_OCT_STEPS, 0.0, 7.0), 2);
+                  Serial.print(F("Setting filter cutoff to: "));
+                  Serial.println(1.0 - float(effect_filter_cutoff) / ENC_FILTER_CUT_STEPS, 5);
 #endif
                   break;
               }
@@ -405,9 +379,9 @@ void ui_show_main(void)
     lcd.clear();
   }
 
-  lcd.show(0, 0, 2, bank);
+  lcd.show(0, 0, 2, configuration.bank);
   lcd.show(0, 2, 1, " ");
-  strip_extension(bank_names[bank], bank_name);
+  strip_extension(bank_names[configuration.bank], bank_name);
 
   if (ui_main_state == UI_MAIN_BANK || ui_main_state == UI_MAIN_BANK_SELECTED)
   {
@@ -422,18 +396,18 @@ void ui_show_main(void)
     lcd.show(0, 11, 1, " ");
   }
 
-  lcd.show(1, 0, 2, voice + 1);
+  lcd.show(1, 0, 2, configuration.voice + 1);
   lcd.show(1, 2, 1, " ");
   if (ui_main_state == UI_MAIN_VOICE || ui_main_state == UI_MAIN_VOICE_SELECTED)
   {
     lcd.show(1, 2, 1, "[");
-    lcd.show(1, 3, 10, voice_names[voice]);
+    lcd.show(1, 3, 10, voice_names[configuration.voice]);
     lcd.show(1, 14, 1, "]");
   }
   else
   {
     lcd.show(1, 2, 1, " ");
-    lcd.show(1, 3, 10, voice_names[voice]);
+    lcd.show(1, 3, 10, voice_names[configuration.voice]);
     lcd.show(1, 14, 1, " ");
   }
 
@@ -450,18 +424,18 @@ void ui_show_volume(void)
     lcd.show(0, 0, LCD_CHARS, "Volume");
   }
 
-  lcd.show(0, LCD_CHARS - 3, 3, vol * 100);
-  if (vol == 0.0)
+  lcd.show(0, LCD_CHARS - 3, 3, configuration.vol * 100);
+  if (configuration.vol == 0.0)
     lcd.show(1, 0, LCD_CHARS , " ");
   else
   {
-    if (vol < (float(LCD_CHARS) / 100))
+    if (configuration.vol < (float(LCD_CHARS) / 100))
       lcd.show(1, 0, LCD_CHARS, "*");
     else
     {
-      for (uint8_t i = 0; i < map(vol * 100, 0, 100, 0, LCD_CHARS); i++)
+      for (uint8_t i = 0; i < map(configuration.vol * 100, 0, 100, 0, LCD_CHARS); i++)
         lcd.show(1, i, 1, "*");
-      for (uint8_t i = map(vol * 100, 0, 100, 0, LCD_CHARS); i < LCD_CHARS; i++)
+      for (uint8_t i = map(configuration.vol * 100, 0, 100, 0, LCD_CHARS); i < LCD_CHARS; i++)
         lcd.show(1, i, 1, " ");
     }
   }
@@ -479,12 +453,12 @@ void ui_show_midichannel(void)
     lcd.show(0, 0, LCD_CHARS, "MIDI Channel");
   }
 
-  if (midi_channel == MIDI_CHANNEL_OMNI)
+  if (configuration.midi_channel == MIDI_CHANNEL_OMNI)
     lcd.show(1, 0, 4, "OMNI");
   else
   {
-    lcd.show(1, 0, 2, midi_channel);
-    if (midi_channel == 1)
+    lcd.show(1, 0, 2, configuration.midi_channel);
+    if (configuration.midi_channel == 1)
       lcd.show(1, 2, 2, "  ");
   }
 
@@ -497,32 +471,12 @@ void ui_show_effects_filter(void)
   {
     lcd.clear();
     lcd.show(0, 0, LCD_CHARS, "Filter");
-    lcd.show(0, 7, 2, "F:");
     lcd.show(1, 0, 4, "Res:");
-    lcd.show(1, 8, 4, "Oct:");
+    lcd.show(1, 8, 4, "Cut:");
   }
 
-  if (effect_filter_frq == ENC_FILTER_FRQ_STEPS)
-  {
-    lcd.show(0, 10, 4, "OFF ");
-  }
-  else
-  {
-    lcd.show(0, 10, 4, uint16_t(EXP_FUNC((float)map(effect_filter_frq, 0, ENC_FILTER_FRQ_STEPS, 0, 1024) / 150.0) * 10.0 + 80.5));
-  }
   lcd.show(1, 5, 2, map(effect_filter_resonance, 0, ENC_FILTER_RES_STEPS, 0, 99));
-  lcd.show(1, 13, 2, map(effect_filter_octave, 0, ENC_FILTER_OCT_STEPS, 0, 80));
-
-  if (ui_main_state == UI_MAIN_FILTER_FRQ)
-  {
-    lcd.show(0, 9, 1, "[");
-    lcd.show(0, 14, 1, "]");
-  }
-  else
-  {
-    lcd.show(0, 9, 1, " ");
-    lcd.show(0, 14, 1, " ");
-  }
+  lcd.show(1, 13, 2, map(effect_filter_cutoff, 0, ENC_FILTER_CUT_STEPS, 0, 99));
 
   if (ui_main_state == UI_MAIN_FILTER_RES)
   {
@@ -535,7 +489,7 @@ void ui_show_effects_filter(void)
     lcd.show(1, 7, 1, " ");
   }
 
-  if (ui_main_state == UI_MAIN_FILTER_OCT)
+  if (ui_main_state == UI_MAIN_FILTER_CUT)
   {
     lcd.show(1, 12, 1, "[");
     lcd.show(1, 15, 1, "]");
diff --git a/UI.h b/UI.h
index c77003f..c720677 100644
--- a/UI.h
+++ b/UI.h
@@ -36,29 +36,23 @@
 extern Encoder4 enc[2];
 extern int32_t enc_val[2];
 extern Bounce but[2];
-extern float vol;
-extern float pan;
 extern LiquidCrystalPlus_I2C lcd;
-extern uint8_t bank;
+extern config_t configuration;
 extern uint8_t max_loaded_banks;
-extern uint8_t voice;
 extern char bank_name[BANK_NAME_LEN];
 extern char voice_name[VOICE_NAME_LEN];
 extern uint8_t ui_state;
 extern uint8_t ui_main_state;
-extern uint8_t midi_channel;
-extern void eeprom_write(uint8_t status);
+extern void eeprom_write(void);
 extern void set_volume(float v, float pan);
 extern elapsedMillis autostore;
 extern elapsedMillis long_button_pressed;
-extern uint8_t effect_filter_frq;
+extern uint8_t effect_filter_cutoff;
 extern uint8_t effect_filter_resonance;
-extern uint8_t effect_filter_octave;
 extern uint8_t effect_delay_time;
 extern uint8_t effect_delay_feedback;
 extern uint8_t effect_delay_volume;
 extern bool effect_delay_sync;
-extern AudioFilterStateVariable filter1;
 extern AudioEffectDelay delay1;
 extern AudioMixer4 mixer1;
 extern AudioMixer4 mixer2;
@@ -72,7 +66,7 @@ void ui_show_effects_delay(void);
 float mapfloat(float val, float in_min, float in_max, float out_min, float out_max);
 
 enum ui_states {UI_MAIN, UI_VOLUME, UI_MIDICHANNEL, UI_EFFECTS_FILTER, UI_EFFECTS_DELAY};
-enum ui_main_states {UI_MAIN_BANK, UI_MAIN_VOICE, UI_MAIN_BANK_SELECTED, UI_MAIN_VOICE_SELECTED, UI_MAIN_FILTER_FRQ, UI_MAIN_FILTER_RES, UI_MAIN_FILTER_OCT, UI_MAIN_DELAY_TIME, UI_MAIN_DELAY_FEEDBACK, UI_MAIN_DELAY_VOLUME};
+enum ui_main_states {UI_MAIN_BANK, UI_MAIN_VOICE, UI_MAIN_BANK_SELECTED, UI_MAIN_VOICE_SELECTED, UI_MAIN_FILTER_RES, UI_MAIN_FILTER_CUT, UI_MAIN_DELAY_TIME, UI_MAIN_DELAY_FEEDBACK, UI_MAIN_DELAY_VOLUME};
 
 class MyEncoder : public Encoder
 {
diff --git a/config.h b/config.h
index 77d4b90..0fd77d3 100644
--- a/config.h
+++ b/config.h
@@ -31,7 +31,7 @@
 // ATTENTION! For better latency you have to redefine AUDIO_BLOCK_SAMPLES from
 // 128 to 64 in <ARDUINO-IDE-DIR>/cores/teensy3/AudioStream.h
 
-#define VERSION "0.9.2"
+#define VERSION "0.9.4"
 
 //*************************************************************************************************
 //* DEVICE SETTINGS
@@ -41,6 +41,7 @@
 #define MIDI_DEVICE_DIN Serial1
 #define MIDI_DEVICE_USB 1
 #define MIDI_DEVICE_USB_HOST 1
+#define MIDI_DEVICE_NUMBER 0
 
 // AUDIO
 // If nothing is defined PT8211 is used as audio output device!
@@ -89,6 +90,11 @@
 #endif
 #define SAMPLE_RATE 44100
 
+//*************************************************************************************************
+//* UI AND DATA-STORE SETTINGS
+//*************************************************************************************************
+#define CONTROL_RATE_MS 200
+#define TIMER_UI_HANDLING_MS 100
 
 //*************************************************************************************************
 //* DEBUG OUTPUT SETTINGS
@@ -114,13 +120,11 @@
 
 // Encoder with button
 #define ENC_VOL_STEPS 43
-#define ENC_FILTER_FRQ_STEPS 50
-#define ENC_FILTER_RES_STEPS 35
-#define ENC_FILTER_OCT_STEPS 27
+#define ENC_FILTER_RES_STEPS 100
+#define ENC_FILTER_CUT_STEPS 100
 #define ENC_DELAY_TIME_STEPS 50
 #define ENC_DELAY_FB_STEPS 35
 #define ENC_DELAY_VOLUME_STEPS 50
-#define TIMER_UI_HANDLING_MS 100
 #define NUM_ENCODER 2
 #define ENC_L_PIN_A  3
 #define ENC_L_PIN_B  2
@@ -144,22 +148,7 @@
 #define AUTOSTORE_FAST_MS 50
 
 // EEPROM address
-#define EEPROM_OFFSET 0
-#define EEPROM_DATA_LENGTH 5
-
-#define EEPROM_CRC32_ADDR EEPROM.length()-sizeof(uint32_t)-33
-#define EEPROM_BANK_ADDR 0
-#define EEPROM_VOICE_ADDR 1
-#define EEPROM_MASTER_VOLUME_ADDR 2
-#define EEPROM_PAN_ADDR 3
-#define EEPROM_MIDICHANNEL_ADDR 4
-
-#define EEPROM_UPDATE_BANK (1<<0)
-#define EEPROM_UPDATE_VOICE (1<<1)
-#define EEPROM_UPDATE_VOL (1<<2)
-#define EEPROM_UPDATE_PAN (1<<3)
-#define EEPROM_UPDATE_MIDICHANNEL (1<<4)
-#define EEPROM_UPDATE_CHECKSUM (1<<7)
+#define EEPROM_START_ADDRESS 0
 
 #define MAX_BANKS 100
 #define MAX_VOICES 32 // voices per bank
@@ -193,4 +182,13 @@
 #define USE_TEENSY_DSP 1
 #define SUM_UP_AS_INT 1
 
+// struct for holding the current configuration
+struct config_t {
+  uint32_t checksum;
+  uint8_t bank;
+  uint8_t voice;
+  float vol;
+  float pan;
+  uint8_t midi_channel;
+};
 #endif // CONFIG_H_INCLUDED
diff --git a/dexed.cpp b/dexed.cpp
index 8a0a99e..16a830d 100644
--- a/dexed.cpp
+++ b/dexed.cpp
@@ -33,6 +33,7 @@
 #include "sin.h"
 #include "freqlut.h"
 #include "controllers.h"
+#include "PluginFx.h"
 #include <unistd.h>
 #include <limits.h>
 #ifdef USE_TEENSY_DSP
@@ -51,6 +52,7 @@ Dexed::Dexed(int rate)
   Lfo::init(rate);
   PitchEnv::init(rate);
   Env::init_sr(rate);
+  fx.init(rate);
 
   engineMkI = new EngineMkI;
   engineOpl = new EngineOpl;
@@ -63,7 +65,7 @@ Dexed::Dexed(int rate)
     voices[i].live = false;
   }
 
-  max_notes = 16;
+  max_notes = MAX_NOTES;
   currentNote = 0;
   resetControllers();
   controllers.masterTune = 0;
@@ -107,41 +109,41 @@ void Dexed::deactivate(void)
 void Dexed::getSamples(uint16_t n_samples, int16_t* buffer)
 {
   uint16_t i;
+  float sumbuf[n_samples];
 
-  if (refreshVoice) {
-    for (i = 0; i < max_notes; i++) {
+  if (refreshVoice)
+  {
+    for (i = 0; i < max_notes; i++)
+    {
       if ( voices[i].live )
         voices[i].dx7_note->update(data, voices[i].midi_note, voices[i].velocity);
     }
+
     lfo.reset(data + 137);
     refreshVoice = false;
   }
 
-  for (i = 0; i < n_samples; i += _N_) {
+  for (i = 0; i < n_samples; i += _N_)
+  {
     AlignedBuf<int32_t, _N_> audiobuf;
-#ifndef SUM_UP_AS_INT
-    float sumbuf[_N_];
-#endif
 
-    for (uint8_t j = 0; j < _N_; ++j) {
+    for (uint8_t j = 0; j < _N_; ++j)
+    {
       audiobuf.get()[j] = 0;
-#ifndef SUM_UP_AS_INT
-      sumbuf[j] = 0.0;
-#else
-      buffer[i + j] = 0;
-#endif
+      sumbuf[i + j] = 0.0;
     }
 
     int32_t lfovalue = lfo.getsample();
     int32_t lfodelay = lfo.getdelay();
-#ifdef SUM_UP_AS_INT
-    int32_t sum;
-#endif
 
-    for (uint8_t note = 0; note < max_notes; ++note) {
-      if (voices[note].live) {
+    for (uint8_t note = 0; note < max_notes; ++note)
+    {
+      if (voices[note].live)
+      {
         voices[note].dx7_note->compute(audiobuf.get(), lfovalue, lfodelay, &controllers);
-        for (uint8_t j = 0; j < _N_; ++j) {
+
+        for (uint8_t j = 0; j < _N_; ++j)
+        {
           int32_t val = audiobuf.get()[j];
           val = val >> 4;
 #ifdef USE_TEENSY_DSP
@@ -149,45 +151,29 @@ void Dexed::getSamples(uint16_t n_samples, int16_t* buffer)
 #else
           int32_t clip_val = val < -(1 << 24) ? 0x8000 : val >= (1 << 24) ? 0x7fff : val >> 9;
 #endif
-#ifdef SUM_UP_AS_INT
-          //sum = buffer[i + j] + (clip_val >> REDUCE_LOUDNESS)*(float(data[DEXED_GLOBAL_PARAMETER_OFFSET+DEXED_VOICE_VOLUME])/255);
-          sum = buffer[i + j] + (clip_val >> REDUCE_LOUDNESS);
-          if (buffer[i + j] > 0 && clip_val > 0 && sum < 0)
-          {
-            sum = INT_MAX;
-            overload++;
-          }
-          else if (buffer[i + j] < 0 && clip_val < 0 && sum > 0)
-          {
-            sum = INT_MIN;
-            overload++;
-          }
-          buffer[i + j] = sum;
-          audiobuf.get()[j] = 0;
-#else
-          float f = static_cast<float>(clip_val >> REDUCE_LOUDNESS) / 0x8000;
-          if (f > 1)
+
+          float f = static_cast<float>(clip_val >> REDUCE_LOUDNESS) / 0x7fff;
+          if (f > 1.0)
           {
-            f = 1;
+            f = 1.0;
             overload++;
           }
-          else if (f < -1)
+          else if (f < -1.0)
           {
-            f = -1;
+            f = -1.0;
             overload++;
           }
-          sumbuf[j] += f;
+          sumbuf[i + j] += f;
           audiobuf.get()[j] = 0;
-#endif
         }
       }
     }
-#ifndef SUM_UP_AS_INT
-    for (uint8_t j = 0; j < _N_; ++j) {
-      buffer[i + j] = static_cast<int16_t>(sumbuf[j] * 0x8000);
-    }
-#endif
   }
+
+  fx.process(sumbuf, n_samples);
+
+  for (i = 0; i < n_samples; ++i)
+    buffer[i] = static_cast<int16_t>(sumbuf[i] * 0x7fff);
 }
 
 void Dexed::keydown(uint8_t pitch, uint8_t velo) {
@@ -391,6 +377,54 @@ uint8_t Dexed::getMaxNotes(void)
   return max_notes;
 }
 
+uint8_t Dexed::getNumNotesPlaying(void)
+{
+  uint8_t op_carrier = controllers.core->get_carrier_operators(data[134]); // look for carriers
+  uint8_t i;
+  uint8_t count_playing_voices = 0;
+
+  for (i = 0; i < max_notes; i++)
+  {
+    if (voices[i].live == true)
+    {
+      uint8_t op_amp = 0;
+      uint8_t op_carrier_num = 0;
+
+      memset(&voiceStatus, 0, sizeof(VoiceStatus));
+      voices[i].dx7_note->peekVoiceStatus(voiceStatus);
+
+      for (uint8_t op = 0; op < 6; op++)
+      {
+        if ((op_carrier & (1 << op)))
+        {
+          // this voice is a carrier!
+          op_carrier_num++;
+          if (voiceStatus.amp[op] <= 1069 && voiceStatus.ampStep[op] == 4)
+          {
+            // this voice produces no audio output
+            op_amp++;
+          }
+        }
+      }
+
+      if (op_amp == op_carrier_num)
+      {
+        // all carrier-operators are silent -> disable the voice
+        voices[i].live = false;
+        voices[i].sustained = false;
+        voices[i].keydown = false;
+#ifdef DEBUG
+        Serial.print(F("Shutdown voice: "));
+        Serial.println(i, DEC);
+#endif
+      }
+      else
+        count_playing_voices++;
+    }
+  }
+  return (count_playing_voices);
+}
+
 bool Dexed::loadSysexVoice(uint8_t* new_data)
 {
   uint8_t* p_data = data;
diff --git a/dexed.h b/dexed.h
index 02a7383..6188f1e 100644
--- a/dexed.h
+++ b/dexed.h
@@ -34,6 +34,7 @@
 #include "fm_core.h"
 #include "EngineMkI.h"
 #include "EngineOpl.h"
+#include "PluginFx.h"
 #include <Audio.h>
 #include "config.h"
 
@@ -160,9 +161,11 @@ class Dexed
     void keydown(uint8_t pitch, uint8_t velo);
     void setSustain(bool sustain);
     bool getSustain(void);
+    uint8_t getNumNotesPlaying(void);
 
     ProcessorVoice voices[MAX_NOTES];
     Controllers controllers;
+    PluginFx fx;
 
     uint8_t data[173] = {
       95, 29, 20, 50, 99, 95, 00, 00, 41, 00, 19, 00, 00, 03, 00, 06, 79, 00, 01, 00, 14, // OP6 eg_rate_1-4, level_1-4, kbd_lev_scl_brk_pt, kbd_lev_scl_lft_depth, kbd_lev_scl_rht_depth, kbd_lev_scl_lft_curve, kbd_lev_scl_rht_curve, kbd_rate_scaling, amp_mod_sensitivity, key_vel_sensitivity, operator_output_level, osc_mode, osc_freq_coarse, osc_freq_fine, osc_detune
@@ -190,6 +193,7 @@ class Dexed
     bool monoMode;
     bool refreshVoice;
     uint8_t engineType;
+    VoiceStatus voiceStatus;
     Lfo lfo;
     FmCore* engineMsfa;
     EngineMkI* engineMkI;