Wow, interesting gadget. Unfortunately it's mono in, stereo out
.
So 2 ways come to mind (unless you want to run mono in and loose half the MP1 (stereo chorus mostly)). These 2 options preserve stereo of both units.
1. Use a small 4 channel desk/mixer with one FX send:
Guit > G-Sys in, G-Sys 5th Element send > MP1 in, MP1 fx loop send OR mixer fx send > 5th Element rtrn, MP1 A/B out > mixer chan 1 & 2, G-Sys L/R out > mixer 3 & 4, Mixer L/R out > stereo poweramp etc.
2. Guit > G-Sys in, G-Sys 5th Element send > MP1 in, MP1 fx loop send > 5th Element rtrn, MP1 A/B out > stereo poweramp 1, G-Sys L/R out > stereo poweramp 2 etc (so kind of wet/dry but needs 2 poweramps and appropriate speakers
).
However, if you can individually pan the G-Sys loop returns
(and depending how the G-Sys loops work (normally loop in/out toggles the return on/off and send stays active)) you could go:
Guitar > G-Sys in, Loop1 send > MP1 in, MP1 Out A/B > Loop1 & Loop2 returns, G-Sys L/R out > stereo power amp