Hey folks just joined and have tried to find an answer to my problem but can't I am trying to use a 4 cable method on my Roadster and am having difficulties. I either get no sound at all or sound but my channels wont switch. It all stays clean. I think I ran the cables right: Guitar into G-System input, G-Sys mono output into front of the amp, effects loop send into G-Sys insert return, effects loop return into G-Sys send. Insert is turned on and locked. I'm stumped and any help would be awesome. Thanks!