Doepfer

Hi John

> Does anyone know if there is any way to mod the VCA on the A-107 to
> reduce the noise level?  
To my knowledge the A107 is using a Curtis Chip CEM3372 which integrates 
VCF and VCA.

If you are knowledged in measuring signals, you might check at pin 17 
whether the  VCF signal itself is noisy already. pin 12 is the VCA input 
  pin 14 is the VCA output. There should be a buffer opamp after the 
output, which might be noisy too. In theory you might skip the VCA, by 
connecting pin17 directly to this buffer, and use an external VCA.

To avoid noise at the VCA, you should assure to feed a full signal level 
to the VCF input already. And keep in mind, that some filter settings, 
which reduce the energy of the signal (Bandpass), will provide lower 
signal levels to the VCA.

Florian