For what I understood & measured with a volt meter:
At zero it is muted/silent.Fully clockwise it is just passing through the
signal.
Fully anti-clockwise it is passing through the signal inverted.
Anything in between is attenuation.

Extra feature: if nothing is patched in to channel 1 it serves as an offset
generator. (Adding/subtracting accordingly to which way you turned its pot)
My 138c manages to add 5.8 volt and subtract 6.9 volt.

Hope that helps.

Ernst

On Thu, Jan 8, 2009 at 3:00 AM, mirror_saw7778 < haven1@... > wrote:

> if one of the pots is at 12 o'clock - is the signal at zero / silent /
> muted
>
> I am not sure if the module just adds gain or if it starts by
> attenuating, then adding gain.
>
> Hope that made sense.
>
>
>


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