to get things a bit more clear:
At the moment, my amp is wired exactly as cavalli shows for the "alternate wiring scheme".
Today the parts for the GLB arrived.
is not connected. Both channels of the pot have to be connected with their ground pins to ground
or there will be hum!
The two ground-pins of the pot are connected with a piece of wired, bridged, so to say.
The ground of the input jacks is also wired to those pins, as well as each "IG" is connected.
output jack. Doing so should result in no hum...?
Output jack is connected to star ground.
Ground of the RCAs (which is wired to the pots ground pins) is only connected
to "IG", not to star ground.
May that be the problem?