I recently acquired a Bandit 75 on eBay.  I've noticed that the passive tone controls (T,M,B), while very effective in clean mode, seem to have no effect whatsoever in lead mode.  The presence control is very effective in both modes.  I've pulled the circuit board from the chassis to do basic cleaning, and while in there I saw no evidence of any modifications to the circuit.  However, it doesn't make sense for Peavey to have designed in a tone stack bypass for the lead mode.
Does anyone have access to a pdf of this schematic?