I use a Voicelive play electric for vocal harmonies. I use a mic input and both the stereo xlr outputs into a mixer/PA. I want to feed a signal into the unit from my guitar via an ABY pedal in order for it to work out the harmonies from the chords Im playing ( and possibly be able to use the tuner )...but muted. I dont want any guitar signal to pass into the mixer/PA via the Voicelive play unit (as I want my guitar sound to be direct from my pedalboard into my amp). How do I achieve this ? Thanks in advance.