I'm thinking of getting a Helix Rack when it comes out, and would like to use it with a Shure GLXD4 wireless receiver, placed on top of the Helix rack, as I already have the Shure transmitter. Would I be able to use the aux in on the back of the Helix rack as an instrument input, or would I have to have a short guitar cable coming out of the receiver to the front of the Helix. Being able to plug in behind the Helix would be a neater option. Any info would be gratefully received.