Added delay, reverb, filter - just with fixed values - only as a first test.

Fixed maximum note allocation code in dexed.h.

MicroDexed.ino

@@ -51,25 +51,43 @@ uint8_t ui_main_state = UI_MAIN_VOICE;
 #endif
 
 // GUItool: begin automatically generated code
-AudioPlayQueue           queue1;         //xy=494,404
+AudioPlayQueue           queue1;         //xy=694.0277709960938,601.9166259765625
-AudioAnalyzePeak         peak1;          //xy=695,491
+AudioFilterStateVariable filter1;        //xy=434.44439697265625,456.6666564941406
+AudioEffectDelay         delay1;         //xy=895.5554809570312,542.2223510742188
+AudioAnalyzePeak         peak1;          //xy=987.25,722.25
+AudioMixer4              mixer1;         //xy=1054.6109619140625,591.2499389648438
+AudioEffectFreeverb      freeverb1;     //xy=1120,352.22222900390625
+AudioAmplifier           amp1;           //xy=1086.666748046875,537.7777709960938
+AudioAmplifier           amp2;           //xy=1206.6666666666667,416.66666666666663
 #ifdef TEENSY_AUDIO_BOARD
-AudioOutputI2S           i2s1;           //xy=1072,364
+AudioOutputI2S           i2s1;           //xy=1364.25,595.25
+AudioControlSGTL5000     sgtl5000_1;     //xy=371.33319091796875,513.8888549804688
 AudioConnection          patchCord1(queue1, peak1);
-AudioConnection          patchCord2(queue1, 0, i2s1, 0);
+AudioConnection          patchCord2(queue1, delay1);
-AudioConnection          patchCord3(queue1, 0, i2s1, 1);
+AudioConnection          patchCord3(queue1, 0, filter1, 0);
-AudioControlSGTL5000     sgtl5000_1;     //xy=700,536
+AudioConnection          patchCord4(filter1, 0, mixer1, 0);
+AudioConnection          patchCord5(delay1, 0, mixer1, 1);
+AudioConnection          patchCord6(mixer1, amp1);
+AudioConnection          patchCord7(mixer1, freeverb1);
+AudioConnection          patchCord8(freeverb1, amp2);
+AudioConnection          patchCord9(amp1, delay1);
+AudioConnection          patchCord10(amp2, 0, i2s1, 0);
+AudioConnection          patchCord11(amp2, 0, i2s1, 1);
 #else
 AudioOutputPT8211        pt8211_1;       //xy=1079,320
 AudioAmplifier           volume_master;           //xy=678,393
 AudioAmplifier           volume_r;           //xy=818,370
 AudioAmplifier           volume_l;           //xy=818,411
 AudioConnection          patchCord1(queue1, peak1);
-AudioConnection          patchCord2(queue1, volume_master);
+AudioConnection          patchCord2(queue1, delay1);
-AudioConnection          patchCord3(volume_master, volume_r);
+AudioConnection          patchCord3(queue1, 0, mixer1, 0);
-AudioConnection          patchCord4(volume_master, volume_l);
+AudioConnection          patchCord4(delay1, 0, mixer1, 1);
-AudioConnection          patchCord5(volume_r, 0, pt8211_1, 0);
+AudioConnection          patchCord5(mixer1, 0, volume_master, 0);
-AudioConnection          patchCord6(volume_l, 0, pt8211_1, 1);
+AudioConnection          patchCord6(amp1, delay1); // feedback-loop
+AudioConnection          patchCord7(volume_master, volume_r);
+AudioConnection          patchCord8(volume_master, volume_l);
+AudioConnection          patchCord9(volume_r, 0, pt8211_1, 0);
+AudioConnection          patchCord10(volume_l, 0, pt8211_1, 1);
 #endif
 // GUItool: end automatically generated code
 
@@ -205,6 +223,18 @@ void setup()
       Serial.println(F("]"));
     }
 #endif
+
+    // fixed delay options
+    delay1.delay(0, 110);
+    mixer1.gain(0, 1.0); // original sigmal
+    mixer1.gain(1, 0.5); // delay tap sigmal
+    amp1.gain(0.1); // feedback level
+    // fixed reverb options
+    freeverb1.roomsize(0.5);
+    freeverb1.damping(0.5);
+    filter1.frequency(1000);
+    filter1.resonance(2);
+    filter1.octaveControl(1);
     // load default SYSEX data
     load_sysex(bank, voice);
   }

addon/FeedbackDelay.cpp

@@ -0,0 +1,97 @@
+// http://digitalmedia.risd.edu/pbadger/PhysComp/index.php?n=Devices.CombinedFilterAndFeedbackDelayCodeFromTheTutorials
+/* Filter combined with Feedback (Echo) Delay from the
+    Teensy Audio Library examples. Check the pins you use
+    on pots. Inputs to the mixer are on inputs 0 (signal) and 1 (delay line)
+*/
+
+#include <Audio.h>
+#include <Wire.h>
+#include <SPI.h>
+#include <SD.h>
+#include <SerialFlash.h>
+
+// GUItool: begin automatically generated code
+AudioPlaySdWav           playSdWav1;     //xy=192,121
+AudioFilterStateVariable filter1;        //xy=396,132
+AudioMixer4              mixer1;         //xy=584,134
+AudioEffectDelay         delay1;         //xy=598,313
+AudioOutputI2S           i2s1;           //xy=799,289
+AudioConnection          patchCord1(playSdWav1, 0, filter1, 0);
+AudioConnection          patchCord2(filter1, 1, mixer1, 0); // filter 1, 1 is bandbass -
+// try filter 1, 0 for high pass
+// try filter 1, 2 for high pass
+AudioConnection          patchCord3(mixer1, delay1);
+AudioConnection          patchCord4(delay1, 0, mixer1, 1);
+AudioConnection          patchCord5(delay1, 0, i2s1, 0);
+AudioConnection          patchCord6(delay1, 0, i2s1, 1);
+AudioControlSGTL5000     sgtl5000_1;     //xy=597,539
+// GUItool: end automatically generated code
+
+
+
+#include <Bounce.h>
+
+Bounce button0 = Bounce(17, 5);
+float freq ;
+int knob2;
+
+void setup() {
+  Serial.begin(57600);   // you may have to set serial monitor to higher speed
+  pinMode(0, INPUT_PULLUP);
+  AudioMemory(200);
+  sgtl5000_1.enable();
+  sgtl5000_1.volume(0.55);
+  sgtl5000_1.enable();
+  sgtl5000_1.volume(0.5);
+  SPI.setMOSI(7);
+  SPI.setSCK(14);
+  if (!(SD.begin(10))) {
+    while (1) {
+      Serial.println("Unable to access the SD card");
+      delay(500);
+    }
+  }
+  mixer1.gain(0, 0.7);
+  mixer1.gain(1, 0.7);
+  delay1.delay(0, 400);
+  filter1.resonance(2.5); // values between 0.7 and 5.0 useful
+  delay(1000);
+}
+
+void loop() {
+  // uncomment for A3 knob to control the feedback level
+
+  if (playSdWav1.isPlaying() == false) {
+    Serial.println("Start playing");
+    playSdWav1.play("SDTEST1.WAV");
+    delay(20); // wait for library to parse WAV info
+  }
+
+  int knob = analogRead(16);
+  float feedback = (float)knob / 1050.0;
+  mixer1.gain(1, feedback);
+  Serial.println(feedback);
+
+  // uncomment for pin 0 button to double the feedback (allowing unstable)
+  /*
+    button0.update();
+    if (button0.read() == LOW) {
+      mixer1.gain(1, feedback * 2.0);
+    }
+
+  */
+
+
+  // read the knob and adjust the filter frequency
+  knob2 = analogRead(A1) + 20;
+  // quick and dirty equation for exp scale frequency adjust
+  freq =  expf((float)knob2 / 150.0) * 20.0 + 80.0;
+  filter1.frequency(freq);
+/*  //uncomment for freq debug
+  Serial.print(knob2);
+  Serial.print("\t");
+  Serial.print("freq = ");
+  Serial.println(freq);
+
+  delay(5); */
+} 

config.h

@@ -44,7 +44,7 @@
 #ifndef TEENSY_AUDIO_BOARD
 #define AUDIO_MEM 80
 #else
-#define AUDIO_MEM 80
+#define AUDIO_MEM 128
 #endif
 #define SAMPLE_RATE 44100
 #define MAX_BANKS 100

dexed.h

@@ -35,6 +35,7 @@
 #include "EngineMkI.h"
 #include "EngineOpl.h"
 #include <Audio.h>
+#include "config.h"
 
 extern uint8_t bank;
 extern uint32_t overload;
@@ -182,7 +183,7 @@ class Dexed
     void keyup(uint8_t pitch);
     void keydown(uint8_t pitch, uint8_t velo);
 
-    static const uint8_t MAX_ACTIVE_NOTES = 16;
+    static const uint8_t MAX_ACTIVE_NOTES = MAX_NOTES;
     uint8_t max_notes = MAX_ACTIVE_NOTES;
     ProcessorVoice voices[MAX_ACTIVE_NOTES];
     uint8_t currentNote;