Boss GP-20 Amp Factory


  • Gain
  • Bass
  • Middle
  • Treble
  • Presence
  • Master
  • Model
  • Speaker Cabinet
  • Memory Write
  • Output (Guitar Amp/Power Amp + SP/Line)


Boss USA

The GP-20 Amp Factory™ offers a variety of incredible COSM® Guitar Amp models designed for live performance or recording—22 in all. Thanks to its simple knob-based controls, two-channel operation, and ability to model the best amps ever made, the brilliant GP-20 is a tonal monster for live or studio applications.

  • COSM Amp Modeling pedal with 22 killer amp models
  • 2-channel operation (Manual/Memory) plus Bypass turns any guitar amp into a 3-channel amp
  • Output Select switch for connection to guitar amps or line-level systems
  • 5 onboard speaker cabinet simulations plus digital output for recording

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