A harmonica player has been happy with his fender 600 but mic'ing up on stage as been troublesome. So I wanted to let anyone else who wants to know about a succesful line out mod. Basically a 22k resister, in series with a 20k pot that's parrallel with a 5k6. This little network is from "hot" side of speaker to ground. You can even use amp as an overdrive for another bigger amp.