> Thanks for the fast answer Dieter, but the 190-2's are in
> independent cases - no connections.
> If I turn up the VCA gain until I hear a constant audible sound I
> can hear it is responding to the whole frequency range.

Sorry - but I have problems to understand the issue. Do you mean that the
full 5 octave range of the A-190-2 is covered when you open the VCA

Best wishes
Dieter Doepfer