thanks so much for posting this...it has solved an issue i was working on.
I have a graphtech ghost piezo system on two custom guitars.
I was able to use the guitar in for the mags and then AUX in for the piezo side, both coming out of a ernie ball pan pedal, so that i would pan/blend between the piezo and mag sounds.
This worked fine, but i was only able to run one amp sim...not two. Do dual mag tones, since the piezo was using up one path.
By having the piezo going into the FX Loop, i can now run a dual amp setup for the mag side, and still pan to the piezo.
Set up like this:
Guitar out with TRS cable, Y split at the end.
Mag side to guitar in.
Piezo side into a Fishman Aura Spectrum pedal, then out to POD HD500 FX loop return.
Expression pedal set to control MIX level of FX Loop, which then acts as a pan between my dual amp mag setup , and my piezo sound.
Next im going to setup some reverb and delay effects after the FX loop at the end of the chain, and then set their mix levels to follow the mix level of the FX Loop.
This way I can still add effects to the piezo sound, but when i pan back to the mag sound, those effects for the acoustic side are cut off, so they dont effect my mag side.
Awesome to have FX set up for both my mag and piezo sound all in the same unit, and still be able to pan/blend the two.