HX Effects piezo acoustic and electric paths in Helix Posted June 14, 2019 I do this with the Helix floor. Piezo (pre-amped in the guitar) goes into the aux input (or one of the effects returns), and guitar into the main input. The guitar path has a guitar amp and some effects, stomp boxes, cab, eq, etc. The piezo path has a 3 sigma IR on it, some compressor/chorus/reverb/etc options. Look for Peter Hamm's most excellent youtube examples of this on Helix rack. I assume the same would be true for the Helix Effects just without the guitar amp options.