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!
USD 329.00
1
In Stock: 15
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).
Demo Videos
Duophony
GFI System Duophony Stereo Parallel Mixing Amp Tones
The Duophony parallel blender by GFI System is the ultimate tone tool for mixing any two preamps together. Duophony can take two stereo signals and mix them in parallel giving you unique tonal combinations. In this demo, we combine the plexi tones of the UA Lion 68 with the fender cleans of the UA Dream 65!
Duophony
The BEST Parallel Effects Blender! GFI System Duophony | Secret Weapons Demo & Review
Confession: Ive been secretly using the Duophony on this page for over a month now. It's become the essential core of my Digital Amp rig, allowing me to blend between the UA Ruby and Dream without compromising on the stereo image of either. But with presets, MIDI, flexible routing, and an LFO (yeah), it'll do so much more.
Signal Path:
Bondi 2026
Benson Boost
Black Mass 1312
Bondi Del Mar
Benson Preamp
Strymon Timeline
Strymon Bigsky
Strymon Flint
UA Ruby, Dream
Strymon Dig
Neunaber Illumine
Hologram Microcosm
Meris LVX
Duophony
They said I took it too far, so I went further.
I've been getting some comments saying I'm not doing the right thing with my harp. Today, I'm going to continue to do the wrong thing, but see how far I can go with it.
Duophony
GFI System Duophony Signal Blender / Guitar Pedal Demo
The Duophony is a really robust signal blender. Breathe new life into your existing pedals!
Duophony
GFI System Duophony Stereo Parallel Mixing Amp Tones
The Duophony parallel blender by GFI System is the ultimate tone tool for mixing any two preamps together. Duophony can take two stereo signals and mix them in parallel giving you unique tonal combinations. In this demo, we combine the plexi tones of the UA Lion 68 with the fender cleans of the UA Dream 65!
Duophony
The BEST Parallel Effects Blender! GFI System Duophony | Secret Weapons Demo & Review
Confession: Ive been secretly using the Duophony on this page for over a month now. It's become the essential core of my Digital Amp rig, allowing me to blend between the UA Ruby and Dream without compromising on the stereo image of either. But with presets, MIDI, flexible routing, and an LFO (yeah), it'll do so much more.
Signal Path:
Bondi 2026
Benson Boost
Black Mass 1312
Bondi Del Mar
Benson Preamp
Strymon Timeline
Strymon Bigsky
Strymon Flint
UA Ruby, Dream
Strymon Dig
Neunaber Illumine
Hologram Microcosm
Meris LVX
Duophony
They said I took it too far, so I went further.
I've been getting some comments saying I'm not doing the right thing with my harp. Today, I'm going to continue to do the wrong thing, but see how far I can go with it.
Duophony
GFI System Duophony Signal Blender / Guitar Pedal Demo
The Duophony is a really robust signal blender. Breathe new life into your existing pedals!
Detailed Features
Full stereo signal paths
Duophony features full stereo signal paths throughout. TRS jacks supports both mono and stereo connections for the inputs and effect loops, while dedicated Left and Right TS jacks are provided for the outputs.
Hassle-free blending with presets
16 presets, readily accessible via the two on-board footswitches, external aux-switches, and MIDI.
Expressive Flexibility
Adjust blending ratio or the Dry signal level at will with an expression pedal!
Fully configurable Heel and Toe values for flexible expressive control. Expression pedals with 10 KOhm pot value are supported.
Modulated Blending
A unique feature that Duophony has is “Modulated Blending”, the ability to modulate the blending action with an internal LFO. When modulation is activated, an internal LFO will produce a waveform whose shape maps directly to the blend ratio. Modulation speed can be controlled via expression pedal, tap-tempo, or MIDI clock.
Comprehensive external control
Expression Pedal - with adjustable heel and toe values.
Aux Switches - accepts up to 3 external switches for versatile control (tap-tempo, bank up/down, etc).
MIDI In - nearly all features and functionalities of the pedal are opened to MIDI access, including MIDI clock.
Purity and Precision
100% analog signal paths, coupled with high headroom and low-noise design preserve your signals and tone.
Precise digital control provides seamless user interface and ease of use.
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!
USD 329.00
1
In Stock: 15
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).
Demo Videos
Duophony
GFI System Duophony Stereo Parallel Mixing Amp Tones
The Duophony parallel blender by GFI System is the ultimate tone tool for mixing any two preamps together. Duophony can take two stereo signals and mix them in parallel giving you unique tonal combinations. In this demo, we combine the plexi tones of the UA Lion 68 with the fender cleans of the UA Dream 65!
Duophony
The BEST Parallel Effects Blender! GFI System Duophony | Secret Weapons Demo & Review
Confession: Ive been secretly using the Duophony on this page for over a month now. It's become the essential core of my Digital Amp rig, allowing me to blend between the UA Ruby and Dream without compromising on the stereo image of either. But with presets, MIDI, flexible routing, and an LFO (yeah), it'll do so much more.
Signal Path:
Bondi 2026
Benson Boost
Black Mass 1312
Bondi Del Mar
Benson Preamp
Strymon Timeline
Strymon Bigsky
Strymon Flint
UA Ruby, Dream
Strymon Dig
Neunaber Illumine
Hologram Microcosm
Meris LVX
Duophony
They said I took it too far, so I went further.
I've been getting some comments saying I'm not doing the right thing with my harp. Today, I'm going to continue to do the wrong thing, but see how far I can go with it.
Duophony
GFI System Duophony Signal Blender / Guitar Pedal Demo
The Duophony is a really robust signal blender. Breathe new life into your existing pedals!
Duophony
GFI System Duophony Stereo Parallel Mixing Amp Tones
The Duophony parallel blender by GFI System is the ultimate tone tool for mixing any two preamps together. Duophony can take two stereo signals and mix them in parallel giving you unique tonal combinations. In this demo, we combine the plexi tones of the UA Lion 68 with the fender cleans of the UA Dream 65!
Duophony
The BEST Parallel Effects Blender! GFI System Duophony | Secret Weapons Demo & Review
Confession: Ive been secretly using the Duophony on this page for over a month now. It's become the essential core of my Digital Amp rig, allowing me to blend between the UA Ruby and Dream without compromising on the stereo image of either. But with presets, MIDI, flexible routing, and an LFO (yeah), it'll do so much more.
Signal Path:
Bondi 2026
Benson Boost
Black Mass 1312
Bondi Del Mar
Benson Preamp
Strymon Timeline
Strymon Bigsky
Strymon Flint
UA Ruby, Dream
Strymon Dig
Neunaber Illumine
Hologram Microcosm
Meris LVX
Duophony
They said I took it too far, so I went further.
I've been getting some comments saying I'm not doing the right thing with my harp. Today, I'm going to continue to do the wrong thing, but see how far I can go with it.
Duophony
GFI System Duophony Signal Blender / Guitar Pedal Demo
The Duophony is a really robust signal blender. Breathe new life into your existing pedals!
Detailed Features
Full stereo signal paths
Duophony features full stereo signal paths throughout. TRS jacks supports both mono and stereo connections for the inputs and effect loops, while dedicated Left and Right TS jacks are provided for the outputs.
Hassle-free blending with presets
16 presets, readily accessible via the two on-board footswitches, external aux-switches, and MIDI.
Expressive Flexibility
Adjust blending ratio or the Dry signal level at will with an expression pedal!
Fully configurable Heel and Toe values for flexible expressive control. Expression pedals with 10 KOhm pot value are supported.
Modulated Blending
A unique feature that Duophony has is “Modulated Blending”, the ability to modulate the blending action with an internal LFO. When modulation is activated, an internal LFO will produce a waveform whose shape maps directly to the blend ratio. Modulation speed can be controlled via expression pedal, tap-tempo, or MIDI clock.
Comprehensive external control
Expression Pedal - with adjustable heel and toe values.
Aux Switches - accepts up to 3 external switches for versatile control (tap-tempo, bank up/down, etc).
MIDI In - nearly all features and functionalities of the pedal are opened to MIDI access, including MIDI clock.
Purity and Precision
100% analog signal paths, coupled with high headroom and low-noise design preserve your signals and tone.
Precise digital control provides seamless user interface and ease of use.
