PVAMP60 PVAMP60 HIGH INPUT LOW INPUT SELECT GAIN TREBLE MIDDLE BASS LENGTH DEPTH VOLUME LINEOUT 11 12 PHONE POWER 13 Functions 1. HIGH INPUT Plug in a hi-level signal here. 2. LOW INPUT Plug in a low-level signal here. 3. GAIN This is the distortion intensity control for the overdrive channel. TECHNICAL SPECIFICATIONS 4. SELECT This switch is select the drive channel or normal Power ~ 110 V, 60 Hz channel. 5.