I did write my own soft synth for the game. Actuall, the biggest part of the development time was taken up doing the sound and the sound engine. I decided to take my time to learn about sound in detail. I became really obsessed researching and experimenting with gutair strings, distortion, flangers, wah wah and trying to invent new ways of doing reverb. I wasted a lot of time but its good, I have a much better appreciation for sound in games now.
I was thinking a bit about grabbing one of the compressed sound players available for java but I was a bit nevous about them. Anyway, now I am happy to have a 45k downloadable java game with very fast loading times.