OK this is the first draft to give an idea of the signal processing after the Volume potentiometer:
Definitely this is a differential balanced amplifier for drive the xlr stage.
The NON INVERTING BRANCH WILL DRIVE THE JACK OUTPUT and half of the XLR.
BOTH BRANCHES WILL DRIVE THE BALANCED OUT ( when present in the guitar...)
Both the OpAmps are configured for a gain of 1.5 each , one inverting and one in phase.
It will be ...(after some more tests and investigations) relatively easy to carry the gain to a 2 factor, replacing R50 with a 10k resistor, and R25 with a 20k resistor(recycling the original R50) :-)
Keep Testing for a optimal gain increase.....valid for both xlr and jack output...
KK
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