Synthesizer/Drum Machine resources help

[koisk]

I bascially had the freedom to make up the topic, so long as it related to the overall subject "Science of music". So mine is on "Drum Machines". I'm covering how they work and thier impact on contemporary music.

What I need material on is how drum machines work. Whatever is involved with making the handclap or snare drum is what I need to talk about. Obviously it could be craaazy involved, but this isn't a thesis so it will only be as in depth as it needs to be.

Adam I'd appreciate you sending any materials/links my way on the subject.