I am having problems knowing how the signals are routed through the effects loops with a stereo setup using both effects loops to/from two tube amps - the preamp signals from the right amp appear in the return to the left amp. I would like to find routing diagrams or descriptions for these signal paths - any info would be appreciated. Also for tube amps should I use pre-amp models and make use of the bypass volume control in order to adjust the patch level to make it same as other patches? I have read the POD HD manuals & MeAmBobbo ~ Thanks ~