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[Andy Mucho]

Byron G. Jacquot
>
> You do have a copy of Hal Chamberlain's "Musical Applications of
> Microprocessors," right?  I think a lot of the techniques covered in there
> would be just as valid in logic as they are in software.

Jim could also do a lot worse than have a look at the Kurzweil K150FS
(fourier synthesiser) which was designed by Hal Chamberlin circa 1985..
Basically just a chip that provided 240 phase accumulating sine oscillators
(there are noise options) with amplitude interpolation.
Simply the hardware for each osc. looks like phase, phaseinc, amp, ampinc..
The sounds from this machine are *unique*. There have been other additive
synths but none have come close to the K150. There was complete editing
package that ran on an AppleIIe called SoundLab, and later Sound Modelling
program. Basically it gave you control over the envelope for each partial in
the form of 256 stage envelopes with breakpoints. As a performance device
this thing still astounds with one of the most comprehensive MIDI specs
you'll see.
If you're about to delve into designing your own additive synth, do yourself
a big favour and check out (IMHO) the very best of that breed.

AndyM