inverse multi-mode filters?!?!

[Don Tillman]

   Date: Wed, 15 May 96 11:45:45 PDT
   From: gstopp at fibermux.com

   So, let me get this straight - a composite sound is produced that has 
   the low end from one source, the mid from a second, and the highs from 
   a third?

Yes, exactly.

   I can imagine doing this with three spearate state-variable filters 
   and a summer, at least as an initial brute-force approach. You could 
   apply the same CV to each so that they sweep together, and if they 
   have VCQ you can control the Q on all 3 at the same time as well. I 
   don't have a clue off the top of my head how to do it with one biquad 
   plus summing, so if this is possible it would be a fun thing to try.

The fact that this would all happen in one simple filter mechanism
might have a bunch of pleasant musical side effects as far as
distortions and signal interaction go.  And having it available as a
resonant mixer-like building block could also be nice.

You could imagine three inputs to one of these, immedediately followed
by a regular multi-mode filter with three (LP/BP/HP) outputs, with
independant LFOs controlling each filter.

  -- Don