Welcome to Beatmmm

Welcome to Beatmmm

GFI System - Duophony

GFI System

Duophony is our take on the lowly 'parallel blender' pedal. We took the basic concept of blending two effects together to the next level by integrating the classic signal blender functionalities with modern features and intuitive user interface. The result is a solid blending machine, optimized to help you unleash the unexplored ideas of parallel blending and discover new ways of sculpting limitless soundscape!

Key Features

  • True stereo on all (inputs, outputs, & FX loops) signal paths.
  • Parallel or Series routing modes.
  • 3 parallel blend modes : XY mix, Y plus [X], and X plus [Y].
  • 16 Presets.
  • Fully adjustable dry signal level.
  • Phase invert function on loop X.
  • Individual gain control for each loop.
  • Bypass function with or without trails.
  • Expression pedal and Aux switches control input.
  • MIDI input.
  • Full-featured modulation engine.


  • Input impedances : 1 MOhm.
  • Output impedances : 500 Ohm.
  • Current draw : ~150 mA.
  • Input / Sends / Returns jacks : 1/4 inch TRS.
  • Output jacks : 1/4 inch TS.
  • Expression / Aux input jack: 1/4 inch TRS.
  • MIDI Input connector: 1/8 inch TRS.
  • USB connector : Type C
  • Dimension : 9.7 x 12 cm (3.8 x 4.7 inch)
  • Power requirement : 9VDC / 150mA, negative-center plug (Power supply is not included).

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