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libraries/audio-tools/examples/examples-communication/a2dp/streams-synth-a2dp/README.md

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+# A Simple Synthesizer for the AI Thinker AudioKit to A2DP Bluetooth Speaker
+
+I was taking the streams-synth-audiokit example and converted the output to go to A2DP. In order to minimize the lag
+I am not using the Stream API but directly the A2DP Callbacks - which avoids any buffers.
+
+The delay howver is still too big to be really useful...
+
+### Dependencies
+
+You need to install the following libraries:
+
+- [Arduino Audio Tools](https://github.com/pschatzmann/arduino-audio-tools)
+- [Midi](https://github.com/pschatzmann/arduino-midi)
+- [ESP32-A2DP](https://github.com/pschatzmann/ESP32-A2DP)
+

libraries/audio-tools/examples/examples-communication/a2dp/streams-synth-a2dp/streams-synth-a2dp.ino

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+/**
+ * @file streams-synth-audiokit.ino
+ * @author Phil Schatzmann
+ * @copyright GPLv3
+ *  
+ */
+
+#define USE_MIDI
+#include "AudioTools.h" // must be first
+#include "AudioTools/AudioLibs/AudioBoardStream.h" // https://github.com/pschatzmann/arduino-audio-driver
+#include "BluetoothA2DPSource.h" // https://github.com/pschatzmann/ESP32-A2DP
+
+BluetoothA2DPSource a2dp_source;
+
+int channels = 2;
+AudioBoardStream kit(AudioKitEs8388V1);
+Synthesizer synthesizer;
+GeneratedSoundStream<int16_t> in(synthesizer); 
+SynthesizerKey keys[] = {{kit.getKey(1), N_C3},{kit.getKey(2), N_D3},{kit.getKey(3), N_E3},{kit.getKey(4), N_F3},{kit.getKey(5), N_G3},{kit.getKey(6), N_A3},{0,0}};
+
+int32_t get_sound_data(Frame *data, int32_t frameCount) {
+  int frame_size = sizeof(int16_t)*channels;
+  int16_t samples = synthesizer.readBytes((uint8_t*)data,frameCount*frame_size);
+  //esp_task_wdt_reset();
+  delay(1);
+  return samples/frame_size;
+}
+
+void setup() {
+  Serial.begin(115200);
+  AudioLogger::instance().begin(Serial,AudioLogger::Info);
+
+  // setup synthezizer keys
+  synthesizer.setKeys(kit.audioActions(), keys, AudioActions::ActiveLow);
+
+  // define synthesizer keys for AudioKit
+  synthesizer.setKeys(kit.audioActions(), keys, AudioActions::ActiveLow);
+  synthesizer.setMidiName("AudioKit Synthesizer");
+  auto cfg = in.defaultConfig();
+  cfg.channels = channels;
+  cfg.sample_rate = 44100;
+  in.begin(cfg);
+
+  a2dp_source.set_data_callback_in_frames(get_sound_data);
+  a2dp_source.start("LEXON MINO L");  
+  a2dp_source.set_volume(20); 
+}
+
+void loop() {
+  kit.processActions();
+  delay(1);
+}