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libraries/audio-tools/examples/tests/etc/callback-write/callback-write.ino

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+#include "AudioTools.h"
+#include "AudioTools/AudioLibs/AudioBoardStream.h"
+
+AudioInfo info(44100, 2, 16);
+SineWaveGenerator<int32_t> sineWave;            // subclass of SoundGenerator with max amplitude of 32000
+GeneratedSoundStream<int32_t> sound(sineWave);  // Stream generated from sine wave
+auto invert = [](uint8_t* data, size_t bytes) {
+  size_t sample_count = bytes / sizeof(int16_t);
+  int16_t* data16 = (int16_t*)data;
+  for (int j = 0; j < sample_count; j++) {
+    data16[j] = -data16[j];
+  }
+  return bytes;
+};
+AudioBoardStream out(AudioKitEs8388V1);
+CallbackStream cb(out, invert);
+StreamCopy copier(cb, sound);  // copies sound into i2s
+
+void setup(void) {
+  Serial.begin(115200);
+  //AudioToolsLogger.begin(Serial, AudioToolsLogLevel::Info);
+  // start input sound
+  sineWave.begin(info, N_B4);
+  cb.begin(info);
+
+  // start I2S in
+  auto cfg = out.defaultConfig(TX_MODE);
+  cfg.copyFrom(info);
+  out.begin(cfg);
+  // set AudioKit to full volume
+  out.setVolume(0.3);
+
+}
+
+void loop() {
+  copier.copy();  // Arduino loop - copy sound to out
+}