Wiardgroup

grant,

i'm not really sure of all the technical details and schematics on
that page, but does that mean the boogie can be patched (i.e. without
extra internal modding/soldering) in a way so as to give lo pass, hi
pass, notch and band pass responses? if so, how?

on another note, i think sam ecoff stated on AH recently that he had
visited you, and that there was a nice surprise in store for all us
wiard fans, any hints or news?

in anticipation ;)

gregg.

p.s. been trying to contact you for a while with regards to an order
we discussed previously, but have got no reply, are you very busy or
is your email software blocking me?

--- In wiardgroup@yahoogroups.com, "grantrichter2001" <grichter@a...>
wrote:
> 
> For some background information on using the Boogie Filter for 
> other filter types, see
> 
> http://www.musicsynthesizer.com/Circuitry/Multi-Function%20VC
> F.htm
> 
> which is the section from the service manual on the Oberheim 
> Expander filter. Of course the Boogie Filter uses discrete 
> Vactrols rather than the CEM chip for improved noise and 
> distortion.
> 
> Cell one is the 6 dB output, cell two is the 12 dB output and so 
> on. Notice the inverters on the 12 and 24 dB outputs, which 
> makes the math "trick" work.
> 
> You can get some idea of mixing coefficients from the resistor 
> values in the summing networks.
> 
> Or just goof around and try stuff!