diff --git a/MicroDexed.ino b/MicroDexed.ino
index b0cc9c6..4c1001f 100644
--- a/MicroDexed.ino
+++ b/MicroDexed.ino
@@ -22,7 +22,6 @@
 #define VOLUME 0.2
 #define SAMPLE_RATE 44100
 #define DEXED_ENGINE DEXED_ENGINE_MODERN
-//#define INIT_AUDIO_QUEUE 1
 //#define SHOW_DEXED_TIMING 1
 #define SHOW_XRUN 1
 #define SHOW_CPU_LOAD_MSEC 5000
@@ -50,12 +49,16 @@ MIDI_CREATE_INSTANCE(HardwareSerial, Serial1, MIDI);
 Dexed* dexed = new Dexed(SAMPLE_RATE);
 IntervalTimer sched;
 bool sd_card_available = false;
+#ifdef TEST_MIDI
+IntervalTimer sched_note_on;
+IntervalTimer sched_note_off;
+#endif
 
 void setup()
 {
   //while (!Serial) ; // wait for Arduino Serial Monitor
   Serial.begin(SERIAL_SPEED);
-  delay(250);
+  delay(50);
   Serial.println(F("MicroDexed based on https://github.com/asb2m10/dexed"));
   Serial.println(F("(c)2018 H. Wirtz"));
   Serial.println(F("setup start"));
@@ -86,61 +89,33 @@ void setup()
   AudioMemoryUsageMaxReset();
 #endif
 
-#ifdef INIT_AUDIO_QUEUE
-  // initial fill audio buffer with empty data
-  while (queue1.available())
-  {
-    int16_t* audio_buffer = queue1.getBuffer();
-    if (audio_buffer != NULL)
-    {
-      memset(audio_buffer, 0, sizeof(int16_t)*AUDIO_BLOCK_SAMPLES);
-      queue1.playBuffer();
-    }
-  }
-#endif
-
   load_sysex("ROM1A.SYX", 20);
 #ifdef DEBUG
   show_patch();
 #endif
-  dexed->activate();
-  dexed->setMaxNotes(MAX_NOTES);
-  dexed->setEngineType(DEXED_ENGINE);
+  //dexed->activate();
+  //dexed->setMaxNotes(MAX_NOTES);
+  //dexed->setEngineType(DEXED_ENGINE);
 
 #ifdef SHOW_CPU_LOAD_MSEC
   sched.begin(cpu_and_mem_usage, SHOW_CPU_LOAD_MSEC * 1000);
 #endif
   Serial.print(F("AUDIO_BLOCK_SAMPLES="));
   Serial.println(AUDIO_BLOCK_SAMPLES);
-  Serial.println(F("setup end"));
-  cpu_and_mem_usage();
 
 #ifdef TEST_MIDI
-  delay(200);
-  randomSeed(analogRead(A0));
-  queue_midi_event(0x90, TEST_NOTE, random(TEST_VEL_MIN, TEST_VEL_MAX));           // 1
-  queue_midi_event(0x90, TEST_NOTE + 5, random(TEST_VEL_MIN, TEST_VEL_MAX));       // 2
-  queue_midi_event(0x90, TEST_NOTE + 8, random(TEST_VEL_MIN, TEST_VEL_MAX));       // 3
-  queue_midi_event(0x90, TEST_NOTE + 12, random(TEST_VEL_MIN, TEST_VEL_MAX));      // 4
-  queue_midi_event(0x90, TEST_NOTE + 17, random(TEST_VEL_MIN, TEST_VEL_MAX));      // 5
-  queue_midi_event(0x90, TEST_NOTE + 20, random(TEST_VEL_MIN, TEST_VEL_MAX));      // 6
-  queue_midi_event(0x90, TEST_NOTE + 24, random(TEST_VEL_MIN, TEST_VEL_MAX));      // 7
-  queue_midi_event(0x90, TEST_NOTE + 29, random(TEST_VEL_MIN, TEST_VEL_MAX));      // 8
-  queue_midi_event(0x90, TEST_NOTE + 32, random(TEST_VEL_MIN, TEST_VEL_MAX));      // 9
-  queue_midi_event(0x90, TEST_NOTE + 37, random(TEST_VEL_MIN, TEST_VEL_MAX));      // 10
-  queue_midi_event(0x90, TEST_NOTE + 40, random(TEST_VEL_MIN, TEST_VEL_MAX));      // 11
-  queue_midi_event(0x90, TEST_NOTE + 44, random(TEST_VEL_MIN, TEST_VEL_MAX));      // 12
-  queue_midi_event(0x90, TEST_NOTE + 49, random(TEST_VEL_MIN, TEST_VEL_MAX));      // 13
-  queue_midi_event(0x90, TEST_NOTE + 52, random(TEST_VEL_MIN, TEST_VEL_MAX));      // 14
-  queue_midi_event(0x90, TEST_NOTE + 57, random(TEST_VEL_MIN, TEST_VEL_MAX));      // 15
-  queue_midi_event(0x90, TEST_NOTE + 60, random(TEST_VEL_MIN, TEST_VEL_MAX));      // 16
-  delay(200);
+  Serial.println(F("MIDI test enabled"));
+  sched_note_on.begin(note_on, 2000000);
+  sched_note_off.begin(note_off, 1333333);
 #endif
+
+  Serial.println(F("setup end"));
+  cpu_and_mem_usage();
 }
 
 void loop()
 {
-  int16_t* audio_buffer; // pointer to 128 * int16_t
+  int16_t* audio_buffer; // pointer to 128 * int16_t (=256 bytes!)
   bool break_for_calculation;
 
   while (42 == 42) // DON'T PANIC!
@@ -153,7 +128,7 @@ void loop()
 
     while (MIDI.read())
     {
-      break_for_calculation = dexed->ProcessMidiMessage(MIDI.getType(), MIDI.getData1(), MIDI.getData2());
+      break_for_calculation = dexed->processMidiMessage(MIDI.getType(), MIDI.getData1(), MIDI.getData2());
       if (break_for_calculation == true)
         break;
     }
@@ -164,10 +139,10 @@ void loop()
 #if defined(SHOW_DEXED_TIMING) || defined(SHOW_XRUN)
     elapsedMicros t1;
 #endif
-    dexed->GetSamples(AUDIO_BLOCK_SAMPLES, audio_buffer);
+    dexed->getSamples(AUDIO_BLOCK_SAMPLES, audio_buffer);
 #ifdef SHOW_XRUN
     uint32_t t2 = t1;
-    if (t2 > 2900)
+    if (t2 > 2900) // everything greater 2.9ms is a buffer underrun!
       Serial.println(F("xrun"));
 #endif
 #ifdef SHOW_DEXED_TIMING
@@ -177,9 +152,53 @@ void loop()
   }
 }
 
+#ifdef TEST_MIDI
+void note_on(void)
+{
+  randomSeed(analogRead(A0));
+  queue_midi_event(0x90, TEST_NOTE, random(TEST_VEL_MIN, TEST_VEL_MAX));
+  // 1
+  queue_midi_event(0x90, TEST_NOTE + 5, random(TEST_VEL_MIN, TEST_VEL_MAX));       // 2
+  queue_midi_event(0x90, TEST_NOTE + 8, random(TEST_VEL_MIN, TEST_VEL_MAX));       // 3
+  queue_midi_event(0x90, TEST_NOTE + 12, random(TEST_VEL_MIN, TEST_VEL_MAX));      // 4
+  queue_midi_event(0x90, TEST_NOTE + 17, random(TEST_VEL_MIN, TEST_VEL_MAX));      // 5
+  queue_midi_event(0x90, TEST_NOTE + 20, random(TEST_VEL_MIN, TEST_VEL_MAX));      // 6
+  queue_midi_event(0x90, TEST_NOTE + 24, random(TEST_VEL_MIN, TEST_VEL_MAX));      // 7
+  queue_midi_event(0x90, TEST_NOTE + 29, random(TEST_VEL_MIN, TEST_VEL_MAX));      // 8
+  queue_midi_event(0x90, TEST_NOTE + 32, random(TEST_VEL_MIN, TEST_VEL_MAX));      // 9
+  queue_midi_event(0x90, TEST_NOTE + 37, random(TEST_VEL_MIN, TEST_VEL_MAX));      // 10
+  queue_midi_event(0x90, TEST_NOTE + 40, random(TEST_VEL_MIN, TEST_VEL_MAX));      // 11
+  queue_midi_event(0x90, TEST_NOTE + 44, random(TEST_VEL_MIN, TEST_VEL_MAX));      // 12
+  queue_midi_event(0x90, TEST_NOTE + 49, random(TEST_VEL_MIN, TEST_VEL_MAX));      // 13
+  queue_midi_event(0x90, TEST_NOTE + 52, random(TEST_VEL_MIN, TEST_VEL_MAX));      // 14
+  queue_midi_event(0x90, TEST_NOTE + 57, random(TEST_VEL_MIN, TEST_VEL_MAX));      // 15
+  queue_midi_event(0x90, TEST_NOTE + 60, random(TEST_VEL_MIN, TEST_VEL_MAX));      // 16
+}
+
+void note_off(void)
+{
+  queue_midi_event(0x80, TEST_NOTE, 0);           // 1
+  queue_midi_event(0x80, TEST_NOTE + 5, 0);       // 2
+  queue_midi_event(0x80, TEST_NOTE + 8, 0);       // 3
+  queue_midi_event(0x80, TEST_NOTE + 12, 0);      // 4
+  queue_midi_event(0x80, TEST_NOTE + 17, 0);      // 5
+  queue_midi_event(0x80, TEST_NOTE + 20, 0);      // 6
+  queue_midi_event(0x80, TEST_NOTE + 24, 0);      // 7
+  queue_midi_event(0x80, TEST_NOTE + 29, 0);      // 8
+  queue_midi_event(0x80, TEST_NOTE + 32, 0);      // 9
+  queue_midi_event(0x80, TEST_NOTE + 37, 0);      // 10
+  queue_midi_event(0x80, TEST_NOTE + 40, 0);      // 11
+  queue_midi_event(0x80, TEST_NOTE + 44, 0);      // 12
+  queue_midi_event(0x80, TEST_NOTE + 49, 0);      // 13
+  queue_midi_event(0x80, TEST_NOTE + 52, 0);      // 14
+  queue_midi_event(0x80, TEST_NOTE + 57, 0);      // 15
+  queue_midi_event(0x80, TEST_NOTE + 60, 0);      // 16
+}
+#endif
+
 bool queue_midi_event(uint8_t type, uint8_t data1, uint8_t data2)
 {
-  return (dexed->ProcessMidiMessage(type, data1, data2));
+  return (dexed->processMidiMessage(type, data1, data2));
 }
 
 #ifdef SHOW_CPU_LOAD_MSEC
@@ -230,108 +249,6 @@ void load_sysex(char *name, uint8_t voice_number)
   }
 }
 
-#ifdef DEBUG
-void show_patch(void)
-{
-  uint8_t i;
-  char voicename[11];
-
-  memset(voicename, 0, sizeof(voicename));
-  for (i = 0; i < 6; i++)
-  {
-    Serial.print(F("OP"));
-    Serial.print(6 - i, DEC);
-    Serial.println(F(":"));
-    Serial.println(F("R1|R2|R3|R4|L1|L2|L3|L4 LEV_SCL_BRK_PT|SCL_LEFT_DEPTH|SCL_RGHT_DEPTH"));
-    Serial.print(dexed->data[(i * 21) + 0], DEC);
-    Serial.print(F(" "));
-    Serial.print(dexed->data[(i * 21) + 1], DEC);
-    Serial.print(F(" "));
-    Serial.print(dexed->data[(i * 21) + 2], DEC);
-    Serial.print(F(" "));
-    Serial.print(dexed->data[(i * 21) + 3], DEC);
-    Serial.print(F(" "));
-    Serial.print(dexed->data[(i * 21) + 4], DEC);
-    Serial.print(F(" "));
-    Serial.print(dexed->data[(i * 21) + 5], DEC);
-    Serial.print(F(" "));
-    Serial.print(dexed->data[(i * 21) + 6], DEC);
-    Serial.print(F(" "));
-    Serial.print(dexed->data[(i * 21) + 7], DEC);
-    Serial.print(F("        "));
-    Serial.print(dexed->data[(i * 21) + 8], DEC);
-    Serial.print(F("             "));
-    Serial.print(dexed->data[(i * 21) + 9], DEC);
-    Serial.print(F("             "));
-    Serial.println(dexed->data[(i * 21) + 10], DEC);
-    Serial.println(F("SCL_L_CURVE|SCL_R_CURVE|OSC_DET|RT_SCALE|VEL_SENS|MOD_SENS|OUT_LEV|FRQ_C|FRQ_F|MOD"));
-    Serial.print(F("      "));
-    Serial.print(dexed->data[(i * 21) + 11], DEC);
-    Serial.print(F("         "));
-    Serial.print(dexed->data[(i * 21) + 12], DEC);
-    Serial.print(F("         "));
-    Serial.print(dexed->data[(i * 21) + 13], DEC);
-    Serial.print(F("        "));
-    Serial.print(dexed->data[(i * 21) + 14], DEC);
-    Serial.print(F("        "));
-    Serial.print(dexed->data[(i * 21) + 15], DEC);
-    Serial.print(F("        "));
-    Serial.print(dexed->data[(i * 21) + 16], DEC);
-    Serial.print(F("        "));
-    Serial.print(dexed->data[(i * 21) + 17], DEC);
-    Serial.print(F("    "));
-    Serial.print(dexed->data[(i * 21) + 18], DEC);
-    Serial.print(F("     "));
-    Serial.print(dexed->data[(i * 21) + 19], DEC);
-    Serial.print(F("     "));
-    Serial.println(dexed->data[(i * 21) + 20], DEC);
-  }
-  Serial.println(F("PR1|PR2|PR3|PR4|PL1|PL2|PL3|PL4"));
-  Serial.print(F(" "));
-  for (i = 0; i < 8; i++)
-  {
-    Serial.print(dexed->data[125 + i], DEC);
-    Serial.print(F("  "));
-  }
-  Serial.println();
-  Serial.print(F("ALG: "));
-  Serial.println(dexed->data[133], DEC);
-  Serial.print(F("OSC_SYNC: "));
-  Serial.println(dexed->data[134], DEC);
-  Serial.print(F("FB: "));
-  Serial.println(dexed->data[135], DEC);
-  Serial.print(F("LFO SPD: "));
-  Serial.println(dexed->data[136], DEC);
-  Serial.print(F("LFO_DLY: "));
-  Serial.println(dexed->data[137], DEC);
-  Serial.print(F("LFO PMD: "));
-  Serial.println(dexed->data[138], DEC);
-  Serial.print(F("LFO_AMD: "));
-  Serial.println(dexed->data[139], DEC);
-  Serial.print(F("PMS: "));
-  Serial.println(dexed->data[140], DEC);
-  Serial.print(F("LFO_WAVEFRM: "));
-  Serial.println(dexed->data[141], DEC);
-  Serial.print(F("LFO_SYNC: "));
-  Serial.println(dexed->data[142], DEC);
-  Serial.print(F("TRNSPSE: "));
-  Serial.println(dexed->data[143], DEC);
-  Serial.print(F("NAME: "));
-  strncpy(voicename, (char *)&dexed->data[144], sizeof(voicename) - 1);
-  Serial.print(F("["));
-  Serial.print(voicename);
-  Serial.println(F("]"));
-  for (i = 155; i < 173; i++)
-  {
-    Serial.print(i, DEC);
-    Serial.print(F(": "));
-    Serial.println(dexed->data[i]);
-  }
-
-  Serial.println();
-}
-#endif
-
 bool load_sysex_voice(File sysex, uint8_t voice_number)
 {
   File file;
@@ -392,21 +309,22 @@ bool load_sysex_voice(File sysex, uint8_t voice_number)
     *(p_data + 168) = 1;        // OP3 ENABLE
     *(p_data + 169) = 1;        // OP4 ENABLE
     *(p_data + 170) = 1;        // OP5 ENABLE
-    *(p_data + 171) = 1;        // OP6 ENABLE   
+    *(p_data + 171) = 1;        // OP6 ENABLE
     *(p_data + 172) = MAX_NOTES;
 
-    dexed->panic();
     dexed->setOPs((*(p_data + 166) << 5) | (*(p_data + 167) << 4) | (*(p_data + 168) << 3) | (*(p_data + 166) << 2) | (*(p_data + 170) << 1) | *(p_data + 171));
     dexed->setMaxNotes(*(p_data + 172));
     dexed->doRefreshVoice();
     dexed->activate();
 
+#ifdef DEBUG
     char voicename[11];
     memset(voicename, 0, sizeof(voicename));
     strncpy(voicename, (char *)&dexed->data[144], sizeof(voicename) - 1);
     Serial.print(F("["));
     Serial.print(voicename);
     Serial.println(F("]"));
+#endif
 
     return (true);
   }
@@ -460,4 +378,104 @@ bool check_sysex(File sysex)
   return (true);
 }
 
+#ifdef DEBUG
+void show_patch(void)
+{
+  uint8_t i;
+  char voicename[11];
 
+  memset(voicename, 0, sizeof(voicename));
+  for (i = 0; i < 6; i++)
+  {
+    Serial.print(F("OP"));
+    Serial.print(6 - i, DEC);
+    Serial.println(F(":"));
+    Serial.println(F("R1|R2|R3|R4|L1|L2|L3|L4 LEV_SCL_BRK_PT|SCL_LEFT_DEPTH|SCL_RGHT_DEPTH"));
+    Serial.print(dexed->data[(i * 21) + 0], DEC);
+    Serial.print(F(" "));
+    Serial.print(dexed->data[(i * 21) + 1], DEC);
+    Serial.print(F(" "));
+    Serial.print(dexed->data[(i * 21) + 2], DEC);
+    Serial.print(F(" "));
+    Serial.print(dexed->data[(i * 21) + 3], DEC);
+    Serial.print(F(" "));
+    Serial.print(dexed->data[(i * 21) + 4], DEC);
+    Serial.print(F(" "));
+    Serial.print(dexed->data[(i * 21) + 5], DEC);
+    Serial.print(F(" "));
+    Serial.print(dexed->data[(i * 21) + 6], DEC);
+    Serial.print(F(" "));
+    Serial.print(dexed->data[(i * 21) + 7], DEC);
+    Serial.print(F("        "));
+    Serial.print(dexed->data[(i * 21) + 8], DEC);
+    Serial.print(F("             "));
+    Serial.print(dexed->data[(i * 21) + 9], DEC);
+    Serial.print(F("             "));
+    Serial.println(dexed->data[(i * 21) + 10], DEC);
+    Serial.println(F("SCL_L_CURVE|SCL_R_CURVE|RT_SCALE| AMS | KVS |OUT_LEV|OP_MOD|FRQ_C|FRQ_F"));
+    Serial.print(F("      "));
+    Serial.print(dexed->data[(i * 21) + 11], DEC);
+    Serial.print(F("         "));
+    Serial.print(dexed->data[(i * 21) + 12], DEC);
+    Serial.print(F("         "));
+    Serial.print(dexed->data[(i * 21) + 13], DEC);
+    Serial.print(F("        "));
+    Serial.print(dexed->data[(i * 21) + 14], DEC);
+    Serial.print(F("        "));
+    Serial.print(dexed->data[(i * 21) + 15], DEC);
+    Serial.print(F("        "));
+    Serial.print(dexed->data[(i * 21) + 16], DEC);
+    Serial.print(F("        "));
+    Serial.print(dexed->data[(i * 21) + 17], DEC);
+    Serial.print(F("    "));
+    Serial.print(dexed->data[(i * 21) + 18], DEC);
+    Serial.print(F("     "));
+    Serial.print(dexed->data[(i * 21) + 19], DEC);
+    Serial.print(F("     "));
+    Serial.println(dexed->data[(i * 21) + 20], DEC);
+  }
+  Serial.println(F("PR1|PR2|PR3|PR4|PL1|PL2|PL3|PL4"));
+  Serial.print(F(" "));
+  for (i = 0; i < 8; i++)
+  {
+    Serial.print(dexed->data[125 + i], DEC);
+    Serial.print(F("  "));
+  }
+  Serial.println();
+  Serial.print(F("ALG: "));
+  Serial.println(dexed->data[134], DEC);
+  Serial.print(F("FB: "));
+  Serial.println(dexed->data[135], DEC);
+  Serial.print(F("OKS: "));
+  Serial.println(dexed->data[136], DEC);
+  Serial.print(F("LFO SPD: "));
+  Serial.println(dexed->data[137], DEC);
+  Serial.print(F("LFO_DLY: "));
+  Serial.println(dexed->data[138], DEC);
+  Serial.print(F("LFO PMD: "));
+  Serial.println(dexed->data[139], DEC);
+  Serial.print(F("LFO_AMD: "));
+  Serial.println(dexed->data[140], DEC);
+  Serial.print(F("LFO_SYNC: "));
+  Serial.println(dexed->data[141], DEC);
+  Serial.print(F("LFO_WAVEFRM: "));
+  Serial.println(dexed->data[142], DEC);
+  Serial.print(F("LFO_PMD: "));
+  Serial.println(dexed->data[143], DEC);
+  Serial.print(F("TRNSPSE: "));
+  Serial.println(dexed->data[143], DEC);
+  Serial.print(F("NAME: "));
+  strncpy(voicename, (char *)&dexed->data[144], sizeof(voicename) - 1);
+  Serial.print(F("["));
+  Serial.print(voicename);
+  Serial.println(F("]"));
+  for (i = 155; i < 173; i++)
+  {
+    Serial.print(i, DEC);
+    Serial.print(F(": "));
+    Serial.println(dexed->data[i]);
+  }
+
+  Serial.println();
+}
+#endif
diff --git a/dexed.cpp b/dexed.cpp
index 02efcfc..23e809f 100644
--- a/dexed.cpp
+++ b/dexed.cpp
@@ -118,7 +118,7 @@ void Dexed::deactivate(void)
   panic();
 }
 
-void Dexed::GetSamples(uint16_t n_samples, int16_t* buffer)
+void Dexed::getSamples(uint16_t n_samples, int16_t* buffer)
 {
   uint16_t i;
 
@@ -165,7 +165,7 @@ void Dexed::GetSamples(uint16_t n_samples, int16_t* buffer)
   }
 }
 
-bool Dexed::ProcessMidiMessage(uint8_t type, uint8_t data1, uint8_t data2)
+bool Dexed::processMidiMessage(uint8_t type, uint8_t data1, uint8_t data2)
 {
   switch (type & 0xf0) {
     case 0x80 :
diff --git a/dexed.h b/dexed.h
index 60a4b44..c7261cd 100644
--- a/dexed.h
+++ b/dexed.h
@@ -27,7 +27,6 @@
 #include "lfo.h"
 #include "synth.h"
 #include "fm_core.h"
-//#include "PluginFx.h"
 #include "EngineMkI.h"
 #include "EngineOpl.h"
 
@@ -61,8 +60,8 @@ class Dexed
     void setEngineType(uint8_t tp);
     bool isMonoMode(void);
     void setMonoMode(bool mode);
-    void GetSamples(uint16_t n_samples, int16_t* buffer);
-    bool ProcessMidiMessage(uint8_t type, uint8_t data1, uint8_t data2);
+    void getSamples(uint16_t n_samples, int16_t* buffer);
+    bool processMidiMessage(uint8_t type, uint8_t data1, uint8_t data2);
     void panic(void);
     void notes_off(void);
     void setMaxNotes(uint8_t n);