Modular Synth Panels

ixqy@... wrote:

> 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?
>
Yes.

> Is this because a passive mixer would load the inputs? Sorry for the 
>technician part of me showing. ;-)
>  
>
Basically, yes.  The Synthacon VCF inputs presume a single low-impedance 
signal coming in.  Injecting two signals at any of these inputs really 
calls for a proper mixing circuit.

What's the opinion about the All pass feature?  I know Cynthia Webster's 
version of the Synthacon has it, but there is not a separate attenuator 
for the All input.

-Richard Brewster