Don't we all own A176 modules to provide for the offset
I see double CV inputs...
That's how I go about it on the A132-1. (which is not exponential I know!)


grtz

Ernst






On Tue, Apr 13, 2010 at 11:41 AM, Florian Anwander < fanwander@...

> wrote:

> Hi,
>
> I just found on the doepfer page http://www.doepfer.de/a1324.htm
>
> Does it make senst to make this VCA exponential, if it does not offer an
> offset
>
> To make it clear: VCAs without an offset are mostly usable for real
> overall signal control only, like the classic "loudness" envelope to the
> final VCA. It basically has to be clear, that there is a standard
> situation "no signal at all" ( = "note off" at the classic synth
> structure).
> Most other use cases like AM of audio or velocity control of signals
> etc. pp. have the standard situation "some signal has to pass", which
> means an offset voltage must control the VCA and this offset control
> must be adjusted always to the corresponding control signal amount.
>
>
> Now: The mentioned standard situation of VCAs without offset uses
> envelopes as CV. But envelopes do not need exponential VCAs. The CV
> itself has already an exponential characteristic.
>
>
> So to my opinion is:
> if this VCA is intended to be exponential it misses a onboard standard
> offset (without that it is useless for exponential use)
> if this VCA is intended to have no onboard standard offset, then it
> should be linear.
> But as it is planned now, it is "neither fish nor fowl".
>
> Florian
>
>
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