Quote:
Originally Posted by
aleyas
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Thinking more about it, the name OPsix makes total sense. Itβs not really an FM synth at all, or at least, not entirely. Itβs a polyphonic operator bank with 4 different synthesis models.
1)Classic FM
2)Ring Modulation
3)Wave Folding
4)Filter FM
A lot of people think about ring mod and folding as an effect, but this is going to be completely different. These are like komplex oscillators to the nth power.
Iβm a bit confused about the wave folding model though, as the diagram doesnβt specify modulator and carrier, unlike the other 3 formulas, just βinput/outputβ. Maybe someone who understands wavefolding better can chime in.
Hi
In digital wavefolding (aka waveshaping), the carrier is your input wave...it then gets phase modulated by a 0hz modulator wave that you canβt really change...some synths let you change the shape (saw, sine, etc) of this 0hz modulator but you canβt change the pitch/frequency of it.
Why is this you ask? Well, anything above 0hz becomes FM again. The illusion of wavefolding is lost and you instead get a very slow pitch LFO again.
Itβs an odd phenomenon, and itβs not how it quite works in the analogue realm (where youβd use real physical circuits like rectifiers to distort a signal) but itβs very useful for synthesis.
An interesting case is the Yamaha SY/TG77. It doesnβt have advertised in-built wavefolding/waveshaping...but because the Operators go down to 0hz, you can set up all sorts of stuff, for instance, run a guitar sample through for some distortion, maybe add a few 0.1ish hz operators for some chorusing/pitch modulation.