Here's the related section from the online manual: "PREAMP OUT/POWER AMP IN (6) A stereo Out/In jack provided for in-line patching of effects devices for each of the two amplifiers. A shielded "Y" cord (Peavey Part #0005299) with a 1/4" stereo phone plug (ring, tip, and sleeve) branching into two 1/4" mono phone plugs is required for this connection (insert fully). The "tip" of the stereo plug routes the signal to effects device input. The effects device output is returned through the "ring". The "sleeve" is ground. The first click of this stereo jack can be used as a preamp output without disturbing the signal flow to the remainder of the system. NOTE: If the second click of the Out/In jack is utilized without returning any signal to the system from an effects device, the preamp functions will be disabled. The preamp level is approximately 1 volt RMS and is high impedance (600 ohms). Any effects device used in this effects loop must be capable of receiving 1 volt input and providing 1 volt output in order to properly drive the power amp" Can this be done two ways? One way going from the first amp's Preamp Out to the second amp's input (instrument jack, uses amp 2's Preamp and EQ), and a second way, going from amp 1's Preamp Out to amp 2's Power Amp In (bypasses amp 2's Preamp)? I'm misunderstanding something. From the manual's description the "tip" is Preamp Out (fx send), but it also says use the "first click" of the Out/In jack. It looks to me like the first click would be the "ring" part of the jack. Can I connect them from amp 1's Preamp Out to amp 2's Power Amp In? I don't want to try it and screw something up.