I am an audio engineer with a heavy emphasis on the computer science end of things, and this is recommended reading for anyone that works on my team.

If you prefer to have an actual book, it is directly available for purchase on Amazon: http://www.amazon.com/Music-Mathematical-Offering-Dave-Benso...

this is great for synth players. The DX7 is extensively covered but i'm sure people on later Yamaha AWM and other wavetable synths will find it directly applicable. (I only have access to SY35 iwth 2 FM operators

The SOS Synth secrets covers some of this material as well: http://www.soundonsound.com/sos/may00/articles/synth.htm

SOS index: http://www.soundonsound.com/sos/allsynthsecrets.htm