var engine = AudioEngine.CreateDefault();
    var buffer = engine.CreateBuffer();
    var source = engine.CreateSource();

    // Play a 1s long sound at 440hz
    AudioFormat format;
    format.BitsPerSample = 16;
    format.Channels = 1;
    format.SampleRate = 44100;
    float freq = 440.0f;
    var size = format.SampleRate;
    var samples = new short[size];

    for (int i = 0; i < size; i++)
    {
        samples[i] = (short)(32760 * Math.Sin((2 * Math.PI * freq) / size * i));
    }

    buffer.BufferData(samples, format);

    source.QueueBuffer(buffer);

    source.Play();

    var engine = AudioEngine.CreateDefault();
    var soundStream = new SoundStream(File.OpenRead("test.mp3"), engine);

    soundStream.Volume = 0.5f;
    soundStream.Play();