I'm not currently connected to the PC. Only cables I have plugged into the 500x are in the 'guitar in', '1/4" out L/mono", and the power plug in. Everything seems plugged in correctly but there's just no sound from the 500x coming from my physical tube amp. Is the problem that i have just a single amp and no head? Maybe some setting is incorrect, I'll have to keep checking. Being new to this sort of stuff is just frustrating lol