Wiardgroup

Hey Grant,

Thanks for your fantastic and informative posts on the Wiard
philosophy, East Coast Vs. West Coast, and for producing wonderful new
modules which bridge the gap between the two!

Previously you have stated that your page about the Matrix 12 filter chip:

http://www.musicsynthesizer.com/Circuitry/Multi-Function%20VCF.htm

is essentially also possible with the Boogie.

I am a little confused about how to obtain these 16 different filter
responses (listed in the picture at the bottom of the above page). I
understand that:

A) FA FB FC FD corresponds to the Boogie's 6,12,18 and 24 dB outputs

B) An external 4 input mixer is needed

C) The jumpers on the circuit board of the Boogie need to be in the
out of phase position

But what I don't really understand is exactly how to patch them all
up, and what the "zero's" and "one's" mean in the picture (I am
assuming "zero" means OFF, i.e. not used/patched at all, and that
"one" means ON, or fully up on the mixer?)  For example, if I want a 3
pole hi-pass then I just mix the 6dB (FA) and 24dB (FD) together, yes?
But what if I want the 4 pole bandpass - that means not mixing ANY of
the outputs, and therefore no signal? That seems strange!

Please enlighten us Grant, I want to know how I can really obtain 16
different filter type responses from my Boogie! I am sure I am missing
something obvious...

Best wishes,

Gregg Janman.