Beat creator

I managed to create my concept in processing, I used this for experimentation using sound. Which was a good way to learn about using the minim and the sound wave. While it doesn't sound or look particularly nice, I have learnt quite a lot about using and implementing sounds. I also think that the sin wave would make sounds that would suit my idea of the retro snake concept.

I can't quite figure out how to make the noise happen only as the circle 'pops', rather than when it pops it changes the sine wave that is currently being heard.

Link to open processing: http://www.openprocessing.org/visuals/?visualID=27761