AudioTrack如何为吉他应用播放超过32种声音

Question

我是一名高中生，正在使用电位器，蓝牙和吉他应用程序进行arduidroid项目。我的问题是，当我弹奏吉他应用程序时，我会收到一个不会崩溃的错误。

AudioFlinger could not create track, status: -12
Error -12 initializing AudioTrack
Error code -20 when initializing AudioTrack.

如何使用此question中的音频发生器，使用3个不同的按钮播放尽可能多的声音。

    void genTone(double freq){
    // fill out the array
    for (int i = 0; i < numSamples; ++i) {
        sample[i]= 2*(i%(sampleRate/freq))/(sampleRate/freq)-1;
    }

    // convert to 16 bit pcm sound array
    // assumes the sample buffer is normalised.
    int idx = 0;
    for (final double dVal : sample) {
        // scale to maximum amplitude
        final short val = (short) ((dVal * 32767));
        // in 16 bit wav PCM, first byte is the low order byte
        generatedSnd[idx++] = (byte) (val & 0x00ff);
        generatedSnd[idx++] = (byte) ((val & 0xff00) >>> 8);

    }
}

void playSound(){
    final AudioTrack audioTrack = new AudioTrack(AudioManager.STREAM_MUSIC,
            sampleRate, AudioFormat.CHANNEL_OUT_STEREO,
            AudioFormat.ENCODING_PCM_16BIT, generatedSnd.length,
            AudioTrack.MODE_STATIC);
    audioTrack.write(generatedSnd, 0, generatedSnd.length);
    audioTrack.play();

}

if(BString.isPressed()){
        /*genTone(BStringFreq);
        playSound();*/

        final Thread thread = new Thread(new Runnable() {
            public void run() {
                genTone(BStringFreq);
                handler.post(new Runnable() {

                    public void run() {
                        playSound();
                    }
                });
            }
        });
        thread.start();
    }

}

以下是我的代码的一些片段。请帮助我，因为我迷失在这个问题上。