The CEM3381/PA381 VCAs have current outputs (not voltage outputs as usual).
The currents of the four CEM3381/PA381 are summed up in a current-to-voltage
converter to obtain a common voltage output. This is why you do not obtain
an signal at the CEM3381/PA381 (current) outputs. One would require a
separate current-to-voltage converter for each section of the CEM3381/PA381
VCAs followed by a (voltage) summing unit. But this would require a lot of
modifications of the A-135 module.

Best wishes
Dieter Doepfer

> I basically want to be able to make seperate outputs for each channel
> after the cv attenuator circuitry. I am having trouble figuring out
> exactly how the circuit works - I was thinking that the final stage
> before each channel's signal get summed and then led through the
> makeup gain ic and then to the master out - is on the pa 381 ic. So my
> plan was to just tap the seperate outputs from the two pa381 ic's and
> then lead each channel into it's own seperate makeup gain opamp,,,,
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> So I tried this but wasn't getting any signal.... I'm sure if I could
> see the schematics I could make better sense of everything,,,, anyhow
> I am hoping somoene can offer some insight on how to actually do this.
>
> It would be great to have the seperate outs,,, would be like have an
> extra 4 vca's available!
>
> Thank You!
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> Yahoo! Groups Links
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