unsigned long a = millis();
unsigned long b = millis();

uint16_t sample_rate=44100;
uint8_t channels = 1;               // channels set at 1                      

GeneratorFromArray<int16_t> waveSR1(arraysine256,0,false);
GeneratedSoundStream<int16_t> sndSR1(waveSR1);             // Stream generated from array1
GeneratorFromArray<int16_t> waveSR2(arraysine256,0,false);
GeneratedSoundStream<int16_t> sndSR2(waveSR2);             // Stream generated from array2

 I2SStream I2S;

 // AnalogAudioStream I2S;  // For internal DAC pins 25 & 26

VolumeStream volume1(sndSR1);  // volume control of inputs
VolumeStream volume2(sndSR2);   

ResampleStream<int16_t> resample1(volume1);    // resample the inputs
ResampleStream<int16_t> resample2(volume2);

  InputMixer<int16_t> mixer;     // mix the resampled

  StreamCopy copier1(I2S, mixer);      // copies mixer sound out to output I2S direct....

  // Arduino Setup

  void setup(void) {  
  //Serial.begin(115200);
 //while(!Serial);
 // AudioLogger::instance().begin(Serial, AudioLogger::Info);

  mixer.add(resample1);     
  mixer.add(resample2);     
  mixer.setWeight(0, 1);     
  mixer.setWeight(1, 1);    

 // Serial.println("running setup");

    // define resample1
  auto rcfg1 = resample1.defaultConfig();
  rcfg1.step_size = 0.6875;      // 0.25  x freqf  Frequency low
  rcfg1.channels = channels;
  resample1.begin(rcfg1); 

 // define resample2
  auto rcfg2 = resample2.defaultConfig();
  rcfg2.step_size = 1.0;      // 1.0      Frequency setting wave2 default
  rcfg2.channels = channels;
  resample2.begin(rcfg2); 
 
  // start I2S internal / external DAC config
 
  auto config = I2S.defaultConfig(TX_MODE);
  config.sample_rate = sample_rate; 
  config.channels = channels;
  config.bits_per_sample = 16;
   
  // for external I2S below...pins used ESP32 PICO KIT.....
   config.pin_bck = 4;       //   4 ... 23
   config.pin_ws = 5;        //   5  ... 19
   config.pin_data = 19;      //  19 ... 22
   config.i2s_format = I2S_LSB_FORMAT;   // for PT8211 DAC ext
      I2S.begin(config);

  // set initial volume
   volume1.setVolume(0.3);
   volume1.begin(config); // we need to provide the bits_per_sample and channels
   volume2.setVolume(0.3);
   volume2.begin(config); // we need to provide the bits_per_sample and channels
 
  // Setup sine wave
  auto cfg1 = waveSR1.defaultConfig();
  auto cfg2 = waveSR2.defaultConfig();
  cfg1.channels = channels;
  cfg1.sample_rate = sample_rate;
  cfg2.channels = channels;
  cfg2.sample_rate = sample_rate;
  waveSR1.begin(cfg1);
  waveSR2.begin(cfg2);

  resample1.setStepSize(freqd);    // change stepsize to change freq wave1 ... this sketch it stays constant
  resample2.setStepSize(freqf);    // change stepsize to change freq wave2 ... this sketch it is varied in playlist
 // Serial.println("setup end");
}

// Arduino loop - copy sound to out 

void loop() {
  copier1.copy();

// Serial.println("running loop");

  playlist();
 
}


void playlist(void) {
  b = millis();
 
if (listp >= 9) listp=0;

if ((b - a) >= 1000) {
 // Serial.println("running playlist");
resample2.setStepSize(NoteArray[listp]*freqf);    // change freq wave 2

 volume1.setVolume(0.5+listp*0.01);   // volume change with a variable .... calc is just to see it changing
 volume2.setVolume(0.3+listp*0.07);   // change each with different values

 a = millis();
 listp++;
}

}