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libraries/audio-tools/examples/examples-audiokit/streams-synthbasic3-audiokit/README.md

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+# A Simple Basic Synthesizer for the AI Thinker Audio Kit
+
+A [detailed description can be found in my blog](https://www.pschatzmann.ch/home/2021/12/17/ai-thinker-audio-kit-building-a-simple-synthesizer-with-the-audiotools-library/) ...
+
+### Dependencies
+
+You need to install the following libraries:
+
+- [Arduino Audio Tools](https://github.com/pschatzmann/arduino-audio-tools)
+- [Arduino Audio Tools - Midi](https://github.com/pschatzmann/arduino-midi)
+

libraries/audio-tools/examples/examples-audiokit/streams-synthbasic3-audiokit/streams-synthbasic3-audiokit.ino

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+/**
+ * @file streams-synthbasic-audiokit.ino
+ * @author Phil Schatzmann
+ * @brief see https://www.pschatzmann.ch/home/2021/12/17/ai-thinker-audio-kit-building-a-simple-synthesizer-with-the-audiotools-library/)
+ *        Midi Support
+ * @copyright GPLv3
+ * 
+ */
+
+#include "AudioTools.h"
+#include "AudioTools/AudioLibs/AudioBoardStream.h"
+#include <Midi.h>
+
+SineWaveGenerator<int16_t> sine;
+GeneratedSoundStream<int16_t> sine_stream(sine); 
+ADSRGain adsr(0.0001,0.0001, 0.9 , 0.0002);
+AudioEffectStream effects(sine_stream);
+AudioBoardStream kit(AudioKitEs8388V1);
+StreamCopy copier(kit, effects); 
+
+class SynthAction : public MidiAction {
+    public:
+        void onNoteOn(uint8_t channel, uint8_t note, uint8_t velocity) {
+           int frq = MidiCommon::noteToFrequency(note);
+           sine.setFrequency(frq);
+           adsr.keyOn();
+        }
+        void onNoteOff(uint8_t channel, uint8_t note, uint8_t velocity) {
+           adsr.keyOff();
+        }
+        void onControlChange(uint8_t channel, uint8_t controller, uint8_t value) {}
+        void onPitchBend(uint8_t channel, uint8_t value) {}
+} action;
+
+MidiBleServer ble("MidiServer", &action);
+
+
+void actionKeyOn(bool active, int pin, void* ptr){
+  Serial.println("KeyOn");
+  float freq = *((float*)ptr);
+  sine.setFrequency(freq);
+  adsr.keyOn();
+}
+
+void actionKeyOff(bool active, int pin, void* ptr){
+  Serial.println("KeyOff");
+  adsr.keyOff();
+}
+
+// We want to play some notes on the AudioKit keys 
+void setupActions(){
+  // assign buttons to notes
+  auto act_low = AudioActions::ActiveLow;
+  static float note[] = {N_C3, N_D3, N_E3, N_F3, N_G3, N_A3}; // frequencies
+  kit.audioActions().add(kit.getKey(1), actionKeyOn, actionKeyOff, act_low, &(note[0])); // C3
+  kit.audioActions().add(kit.getKey(2), actionKeyOn, actionKeyOff, act_low, &(note[1])); // D3
+  kit.audioActions().add(kit.getKey(3), actionKeyOn, actionKeyOff, act_low, &(note[2])); // E3
+  kit.audioActions().add(kit.getKey(4), actionKeyOn, actionKeyOff, act_low, &(note[3])); // F3
+  kit.audioActions().add(kit.getKey(5), actionKeyOn, actionKeyOff, act_low, &(note[4])); // G3
+  kit.audioActions().add(kit.getKey(6), actionKeyOn, actionKeyOff, act_low, &(note[5])); // A3
+}
+
+void setup() {
+  Serial.begin(115200);
+  AudioLogger::instance().begin(Serial,AudioLogger::Warning);
+
+  // setup effects
+  effects.addEffect(adsr);
+
+  // Setup output
+  auto cfg = kit.defaultConfig(TX_MODE);
+  cfg.sd_active = false;
+  kit.begin(cfg);
+  kit.setVolume(80);
+
+  // Setup sound generation based on AudioKit settins
+  sine.begin(cfg, 0);
+  sine_stream.begin(cfg);
+  effects.begin(cfg);
+
+  // activate keys
+  setupActions();
+}
+
+// copy the data
+void loop() {
+  copier.copy();
+  kit.processActions();
+}