Is there a way or another device other than my Scarlet 2 that would allow an input (pedal steel guitar) to be routed to a second output (amp) while routing the Mac's music that it is playing to a separate output, e.g., a sound system? The Scarlet has RCA outputs, but everything is routed to them including what's playing on the MAC and the channel inputs. I need the MAC and inputs to be routed to two different outputs. Any thoughts?