[sdiy] tanh distortion in a filter

[Olivier Gillet]

Caveat: I've never used it in a SVF

> What does it do?  (as in what does it sound like?)

Slight fuzz / soft clipping.

> I assume tanh is something probably best implemented as a table - or is
> there a reasonably good simply implemented approximation that can be used?

The most common approach (at least on machines with a FPU!) is an
approximation with a rational fraction:

http://www.kvraudio.com/forum/viewtopic.php?t=262823

KVRaudio and musicdsp are the places to search for this kind of information.

Olivier