[sdiy] Nonlinearities in IR3109 filters

[Sean Costello]

So right now, my list of filters with intentional clipping used in resonance
path (as opposed to having clipping as part of the filter topology itself)
is:

- Roland SH-101 (4 cascaded OTA 1 poles)
- Roland MC-202 (not sure about this, but probably a good guess) (4 cascaded
OTA 1 poles)
- Korg MS-20 (Sellen-Key)
- Roland SH-09 (4 cascaded OTA 1 poles)
- Oberheim SEM (SVF, clipping in feedback between bandpass and input)

Any others?

Thanks,

Sean Costello