[sdiy] MS20 & nonlinear Feedback & tweaking.

[Scott Gravenhorst]

<np at inverse-entertainment.de> wrote:
>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.

I am no expert, but this sure does look like it
qualifies to me.

>
>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
>

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