Y-splitter cable plugged into Fender Mustang amp, guitar plugged into one side of y-splitter, rocksmith cable plugged into other side of y-splitter. I run a cable from the headphone jack of the computer to the aux input on the amp. I have my headphones plugged into the headphone jack on the amp. I have found that in some of the CDLC my guitar audio is really quiet, running it through the amp I can make it louder. I can also mute the audio from the computer and just hear myself while the computer still picks up my playing. I do get some hum out of the splitter but I can usually fix it by dropping the gain down since I am using headphone (need to try an ABY pedal one of these days.)