Audio doesn't play immediately on button press, and never if released very quickly 

See attached video for a demonstration

I haven't looked into the code to see why this might be the case, and I'm not a very good Android developer but without looking at the code my headcanon is that maybe you're creating an audio context on each button press and when I release the button before it can play the tone it destroys that audio context and you don't hear anything as a result
