MMFX "The Doppler" – Extremely Rare Custom-Built Phaser/Tremolo Pedal – Possibly One-Off or Prototype

Up for sale is a very rare MMFX pedal called "The Doppler." In fact, this may be one of the rarest modern effects pedals you'll come across.

After extensive searching, I have been unable to find any information about this pedal beyond an old MMFX webpage where it appears under the company's Custom Builds section. Based on the lack of documentation and production examples, this pedal appears to be either a one-off custom build for a customer or a prototype that never made it into full production.

Functionally, The Doppler is based around a modified DOD Vibro Thang platform, combining lush phasing effects with a panning-style tremolo. An attached expression pedal controls the modulation speed, making it easy to create everything from slow, swirling movement to fast, dramatic modulation effects.

Features:

• Extremely rare MMFX "The Doppler"
• Custom build, prototype, or one-off production piece
• Based on a modified DOD Vibro Thang circuit
• Warm, organic phaser tones
• Panning-style tremolo effects
• Built-in expression pedal controls modulation speed
• Standard 9V power supply operation
• Great for psychedelic, ambient, surf, indie, experimental, and studio applications

Tone & Performance
The phaser has a particularly warm, musical character that avoids the harshness found in some modern modulation pedals. The tremolo section creates a beautiful sense of movement and space, while the expression pedal allows for real-time control that can produce some truly unique sounds.

For pedal collectors, this is the kind of piece that rarely surfaces. For players, it's a genuinely inspiring effect with sounds that stand apart from the usual production pedals.

Please review all photos carefully and feel free to contact me with any questions. The pedal will be packed securely and shipped promptly.

A fascinating and possibly unique MMFX creation—part collector's piece, part creative tool, and a pedal you're unlikely to see again anytime soon.