Output of final signal

[jhaible]

I have built a special input / output module for my JH-3 Modular.
Two balanced stereo input channels with variable gain to get the
5V amplitude for the synth from any line level signals. "Signal"
and "Overload" LED (green / red).
Two balanced stereo outputs with variable attenuation from
the 5V synth amplitude to any line level amplitude.
Then I have two 4p2t switches that will optionally connect
the first and second input pair to the 1st and 2nd output pair.
This is to connect two external synthesizers to the Modular
if I want to run them thru certain modules. I can switch Modular
on or bypass with a single switch, and input / output level
adjustment will provide seamless integration.
My OB-8 is connected to the JH-3 Modular all the time, and
it's important to get it thru in stereo when on bypass. For
the Modular, there is just a mono signal extracted, however.
Four 1/4" jacks in parallel to feed enough modules without
an extra Multiple.
The second stereo output is mostly used for straight Modular 
synth stuff, but it's built identically to the first channel.

JH.