As I've just posted to KPR in another thread-here is the Andromeda manual still posted on the Alesis site-which give some excellent tutorials about modulation routings, FM and PWM and in general, some very clear explanations about filters among other things, all of which I am finding very helpful-for understanding the Fusion!
Selling a Alesis Andromeda A6 synthesizer in excellent condition, everything works perfectly, The knobs aren't even broken in yet with some that feel...