I often do coffee-house type performances using an acoustic guitar, a shure sm-58 mic, and a 2-channel Ultrasound AG50 acoustic guitar amp. It does an awesome job on both vocals and instrument. I would like to bring out my electric guitar at some point, but only want to use a single amp for simplicity. I've got a Mesa Bogie F30 and a Swart AST. Both are single channel and certainly not geared up for amplifying voice. Is there an amp out there which solves this problem? Do I need 2 amps?