Hi Ethan, Tim, Florian and Bakis,
 Thanks for all this great info!
 I have been experimenting with the options you gave me.
 I noticed some strange things.
 First I patched the A-110 into the in of the A-131 (Exp.)
 and turning up the gain, nothing was heard until I
 reached position 6. I repeated the same experiment with
 the A-130 (Lin.) I also began to turn up the gain and
 immediately at position 2 I began to hear the continious
 drone.
 So there's the big difference which must be due to fact
 that one is the exp. and the other the linear VCA.
 Now, I'm curious at which position will they be equal in
 volume. Can it be before they reach full gain
 Nop, your right Florian both are equal in volume only
 when they reached full gain (=10).
 So I happily conclude that there's nothing wrong with
 my VCA's!
 Before I forget the both in's were at position 8. And the
 general out also on position 8.
 But when I turn both in's (from the two VCA's) to 10,
 I immediately hear that the linear gives more power!
 I also have to say that I directly plugged the A-100 out to
 my mixer in this case.
 In the next example I patched 3 waveforms (pulse, triangle and
 sinus) into the A-138 mixer, the out of the mixer goes to
 the audio in of the A-121 Multimode filter. Filter low out
 first into audio in of A-131 and the A-130 (settings of the
 VCA's are the same as above). There's barely any change.
 Same picture the linear gives a slight more power then the
 exponential.
 Now, when I plug the low out of the A-121 directly in the
 input of the A-138 mixer (lin) the volume is cranked up
 several levels. How come Using this mixer means a more beefed
 up sound then using one of the VCA's
 I believe this picture will be the same if one uses the
 A-138 mixer (exp)! Or am I wrong here
 Can anyone tell me what's the difference between
 the A-138 exp and lin. mixer
 The same goes for both the exp and linear VCA's.
 I have to expand with more VCA's, cause 2 are to little.
 But which one should I take
 Any ideas!
 Thanks,
 Roel.