import krister.Ess.*;

AudioChannel myChannel; // Create channel
TriangleWave myWave; // Create triangle waveform
Envelope myEnvelope; // Create envelope
int numNotes = 200; // Number of notes
int noteDuration = 300; // Duration of each note in milliseconds
float[] rawSequence = { 100, 100, 90, 80, 100, 90, 80, 100, 90, 80, 500, 600,
 100, 100, 90, 80, 100, 90, 80, 100, 90, 80, 500, 600,
  100, 100, 90, 80, 100, 90, 80, 100, 90, 80, 500, 600, 900, 800, 850, 900, 0,
  900, 800, 850, 900, 100, 90, 80, 50 }; 

void setup() 
{
  size(100, 100);
  Ess.start(this); // Start Ess
  myChannel = new AudioChannel(); // Create a new AudioChannel
  myChannel.initChannel(myChannel.frames(rawSequence.length * noteDuration));
  int current = 0;
  myWave = new TriangleWave(480, 0.3); // Create triangle wave
  EPoint[] myEnv = new EPoint[3]; // Three-step breakpoint function
  myEnv[0] = new EPoint(0, 0); // Start at 0
  myEnv[1] = new EPoint(0.25, 1); // Attack
  myEnv[2] = new EPoint(10, 0); // Release
  myEnvelope = new Envelope(myEnv); // Bind Envelope to the breakpoint function
  int time = 0;
  for (int i = 0; i < rawSequence.length; i++) {
    myWave.frequency = rawSequence[current]; // Update waveform frequency
    int begin = myChannel.frames(time); // Starting position within Channel
    int e = int(noteDuration * 0.8);
    int end = myChannel.frames(e); // Ending position with Channel
    myWave.generate(myChannel, begin, end); // Render triangle wave
    myEnvelope.filter(myChannel, begin, end); // Apply envelope
    current++; // Move to next note
    time += noteDuration; // Increment the Channel output point
  }
  myChannel.play(); // Play the sound!
}

void draw() { } // Empty draw() keeps the program running

void stop() 
{
  Ess.stop(); // When program stops, stop Ess too
  super.stop();
}