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I took a class on this once....
Additive - add up all the sine waves to form a desired tone
Subtractive - use filters like peaking LPFs, HPFs, envelopes, etc on various simple waveforms (sine, triangle, ramp, pulse,...)
Frequency modulation - Long live the DX7.....
Phase modulation - Casio had some of these that were pretty good
Sampling - (a dangerous tool, indeed)
COSM - an object modeling computer that calculates output based on properties of the instrument being modeled. Roland V-drums use this.
Probably more......
-tINY
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