I had the same problem recently when I ordered one from Thomann.
I send it back and they send me a new one having the same problem.
I ended up buying some new ICs myself and solved the problem that way.

I'm curious if you ordered it a thomann as well..

greetings,

Ernst

On Thu, Mar 26, 2009 at 11:42 AM, madapples1 < rusty0306@... > wrote:
> yes, I understand it can be difficult to trouble shoot like this. Thanks for
> the reply.
>
> I thought about swapping the ICs to see if it follows one but wanted to ask
> first. I will try that.
>
> Thanks again.
>
> --- In Doepfer_a100@yahoogroups.com , <yahoo@...> wrote:
>>
>> > I did a search of the database and didn't see anything describing this.
>> >
>> > I just got a used a-132 dual voltage controlled amplifier. The
>> > upper VCA is functioning properly. The lower VCA is not working
>> > properly. It has a very low output and "thumps" or "pops" when
>> > it opens/closes no matter what signal I use to open it. There's
>> > a very large difference in the upper and lower channels.
>> >
>> > I was passing audio through it and opening it with an LFO. The
>> > upper channel behaves as expected but the lower does not with the
>> > same signals.
>> >
>> > I also have another A-132 and both channels function very similar
>> > and are similar to the upper channel on the problematic module.
>> >
>> > Anyone have any ideas where to look for the problem
>>
>> From the distance it's difficult to find out what's wrong. If you are
>> experienced with electronics you could swap the integrated circuits of the
>> upper and lower section to find out if one of the integrated circuits is
>> defective. Maybe the module has to be readjusted (nothing but minimizing
>> the
>> "plop" input connected to GND and e.g. an ADSR as CV).
>>
>> Best wishes
>> Dieter Doepfer
>>
>
>