[sdiy] Nonlinear Feedback SVF Tests

[Scott Gravenhorst]

I wish that I were a much better guitar player than
I am.  I finally got around to plugging a guitar into
it and messing for an hour.  It does give some pretty
cool distortion effects.  The only bad thing is that
under certain circumstances, it goes into self 
oscillation which is pretty nasty loud.  I found several
useful sorts of sounds, especially using the LFO to
drive the filter's cutoff freguency.  For me, I find
this box more useful as a synth sound modifier.

I had made this:
http://home.earthlink.net/~chordman/s1.mp3
some time ago as a demo using a FatMan as a sound source.  
It's a major scale first played straight thru, and then 
played again thru the filter.  This is just one of many 
sounds attainable.  Much is determined by what you feed it 
as well as how you set the box.

Schematic:
http://home1.gte.net/res0658s/electronics/NonlinearFeedbackFilter.html

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-- Scott Gravenhorst | LegoManiac / Lego Trains / RIS 1.5
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