Doepfer

hi Sean

> I'm trying to modify my old style A-131 Exp. VCA module to get a 
> gain >1 as the output often seems weedy and I would like the option 
> of a little (or a lot of) overdrive.
> 
> I'm guessing that I can do this in 2 ways:
> 1. change the resistors connected to the audio In pots to a lower value.
> 2. change the resistor connected to the output voltage of the CV circuit.
I think the VCAs OTA is not the place where you should change the level. 
Usually a change of amplification should be done by decreasing the 
feedback resistor of an OpAmp. As far as I remember, the old A131 with 
the Curtis CEM3382 does not use an separate buffer stage at the output 
(thats where you might do this). So I suggest to modify a Mixer A-138, 
where you could change either the feedback of the summing amp (to 
amplify all four inputs), or change the input resistor of one channel.

Florian