[sdiy] MS20 & nonlinear Feedback & tweaking.

[Nils Pipenbrinck]

Hi synth-nerds,

We had that discussion about nonlinear feedback in filters a while ago. I
built the late korg ms-20 filter from René's page some month ago.
(Schemantic is here: http://www.uni-bonn.de/~uzs159/rs20.gif).

One question:

Isn't this a good example of non-linear feedback? There's a classic "guitar
stompbox style" diode clipping in the feedback loop. Or is this one of those
"tricks" I - as a bluddy beginner - doesn't know about.

Furthermore that idea of the tapped output idea that came up last week
sounds interesting. I'm going to try that on the MS20-Filter (because I love
it's hard and cutting resonance sound). Adding two more stages won't be a
problem, and I could use a linear multiplexer to select between 4 feedback
and 4 output positions. (later on I want to control that thing in digital).

Btw. thanks to all who answered me about that 330 ohm thing in the linear
glide buffer. Exactly what I thought. I'm really beginning to understand how
and why things work :)

  Nils Pipenbrinck