[sdiy] multimode matrix filter question

[David G. Dixon]

> It's enough of an important function to have it. With complicated
> multimode filters it's important to be able to run multiple of them in
> parallel without having any funny issues with the levels etc; for
> example you might want to rely on this when doing an all-pass filter
> out of multiple such filter units and then changing their levels
> somehow so that they animate in the music.

If it's just a question of gain, a post-module mixer would do it.  Also, I
can pull as many outputs from each stage as I want, because they're all
buffered separately.  Ditto with the 4P LPF outputs.  Hence, one could use
as many of these matrix filter interfaces as one wanted, all driven from the
same lowpass filter.

> On the other hand it's also important to be able to switch or
> crossfade between the different filter modes without gain issues which
> can be very unmusical.

All possible filter modes will be available simultaneously, so
crossfading/switching could all be done downstream in a separate
mixer/scanner.

> It's just one switch on the front panel. And it's 1u already..

18 jacks spaced 7/8" apart on a 1U MOTM panel take up all the available
space (not counting 1/2" on either end for mounting).

> If you don't want to do it, at least put a location on the PCB for that
> switch.

Hmmm.  Maybe.