Hi Roel,
I suspect what you are experiencing is 'normal'. Because of the
exponential response, the A-131 can chuck out a greater voltage than
the A-130 (at least it is from mine, which is the newer one,
marked 'v2 2001'). A lot of course depends on size of input voltage
after attenuation and the gain setting, but for 5V in, the most I can
get out of the A-130 is about 4.5V, whereas the the A-131 can pump
out almost 9V. Note also that on the A-131 the 2 inputs have
different sensitivities - you should get more 'umph' out of 'In 2'
than you do for 'In 1'.

Tim

> I appreciate some help here.
> I have two VCA's in my system. One A-130 and A-131.
> I know I have bought the mini-system
> two years ago, but didn't noticed only recently that
> there's a big volume difference between the two.
> I explain the A-131 VCA (Exp) sounds much louder
> then the A-130 VCA (Lin). Of course I did notice
> something before, but not being into the difference
> between exp. en lin. I thought it was normal!
> When I told Baikis this, he said that's not normal,
> when you use the audio in of both, they both must
> sound as loud. I can tell you the A-131 is sometimes
> bearely audible, only when I turn the gain to 10, it
> sounds better, but doesn't come close to the volume of
> the A-130.
>
> I hope there's nothing wrong with one of these
> modules
> Is there a possibility that it still might ly in
> the option of Lin. or Exp. I know that one is more
> for audio and the other for cv.
> Any help is welcome.
>
> Thanks,
>
> Roel.