Modular Synth Panels

Hi, 
 Thanks to Richard and John (and Larry!) for the helpful replies. I wasn't 
too sure what circuit was being mention for the All Pass input, but after 
re-reading -

 Do you mean each of the three existing inputs on the PCB (LP/BP/HP) would 
need an opamp mixer in order to sum the All Pass to each of the three said 
inputs? Is this because a passive mixer would load the inputs? Sorry for the 
technician part of me showing. ;-)

 I'm curious...Is there anyone reading this that would be interested in 
ordering this Stooge CGS Synthacon panel? If not, I might just have to go homebrew. 

 Thanks everyone,
 Andrew Sanchez


In a message dated 3/10/04 8:21:04 PM Central Standard Time, pugix@... 
writes:

> Andrew, you meant a second 220K resistor, not 220 ohm.  I'm about to 
>  build my dual Synthacon VCF (two in 2U), and I'll be trying these CV 
>  resistors values, based on a suggestion by Mr. Loffink:  680R from base 
>  of 2N2222 to ground; 430K for the initial freq pot; 360K for the 
>  "1V/Oct" input'; 150K for the FM input with attenuator pot.
>  
>  I see from your proposed Stooge panel that you would put mixer pots on 
>  each of the inputs.  If you make three simple mixers for the inputs, you 
>  can easily add an attenuator pot for the Allpass input.  The mixer 
>  circuit is easy to visualize.  The phase is inverted, but it probably 
>  doesn't matter.  (Now will this drawing come through?)