Is channel one sending a voltage out maybe
When nothing is plugged in channel one and you have the pot open it will
send a voltage out.
Try closing the pot and see if it's still making that sound.

greatings,

Ernst

On Tue, Apr 27, 2010 at 9:51 AM, AS < lupofuga@... > wrote:

>
>
> Hi!
>
> I have a problem with my eurorack system.
> when I connect A138 mixer to general mixer of my studio, the system make an
> high noise (zuuuuuuuuuuuuuuuuummmmm) though other modules aren't connect to
> A138.
> the same problem it is made with all three A138 mixers that I have, and
> with A106-1.
> if I connect the mixer to vca the problem disappared.
> what is the problem
> I use an home made wood case and doepfer A-100 DIY Kit #1 (I connect all
> component of kit be very careful).
>
> Thanks to all!
> AS
>
>
>


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