How to easily Generate Synth Chords Sounds in Android? I wanna be able to generate dynamically an in game Music using 8bit. Tried with AudioTrack, but did not get good results of nice sounds yet.

Any examples out there?

I have tried the following code without success:

public class BitLoose {


private final int duration = 1; // seconds
private final int sampleRate = 4200;
private final int numSamples = duration * sampleRate;
private final double sample[] = new double[numSamples];

final AudioTrack audioTrack;

public BitLoose() {
    audioTrack = new AudioTrack(AudioManager.STREAM_MUSIC,
            sampleRate, AudioFormat.CHANNEL_CONFIGURATION_MONO,
            AudioFormat.ENCODING_PCM_8BIT, numSamples,
            AudioTrack.MODE_STREAM);
    audioTrack.play();
}

public void addTone(final int freqOfTone) {
    // fill out the array
    for (int i = 0; i < numSamples; ++i) {
        sample[i] = Math.sin(2 * Math.PI * i / (sampleRate / freqOfTone));
    }

    // convert to 16 bit pcm sound array
    // assumes the sample buffer is normalised.
    final byte generatedSnd[] = new byte[numSamples];

    int idx = 0;
    for (final double dVal : sample) {
        // scale to maximum amplitude
        final short val = (short) ((((dVal * 255))) % 255);
        // in 16 bit wav PCM, first byte is the low order byte
        generatedSnd[idx++] = (byte) (val);
    }
    audioTrack.write(generatedSnd, 0, sampleRate);
}

public void stop() {
    audioTrack.stop();
}