I play in a acoustic duo and have constructed my sound with the hd500 over the years. Just recently picked up a voicelive 3 in hopes of using the robust looper and harmonies, but I prefer my guitar sounds out of the hd500. I have seen that you can use the guitar thru to connect an amp or processor. Does anyone know what this would look like, how it's routed? Do I use a trs cable?