FoxGear Knee Trembler Guy Pratt Signature Tremolo Pedal

If You Miss the Days When Amps Came With Onboard Tremolo Effects, the Knee Trembler is for You!

The Knee Trembler (Guy Pratt Signature Model) is an insanely good tremolo effect with unique LFO, designed in direct collaboration with Guy Pratt of Pink Floyd fame, perfect for his famous, “One of These Days” bass intros, especially when coupled with the Echosex Baby. If you miss the days when amps came with onboard tremolo, you’ll love the Knee Trembler. It can be as smooth or as cutting of a tremolo as you would want. And keeping in line with Foxgear’s devotion to excellence, it is absolutely transparent and noise free.

Like all of Foxgear’s  Professional Compact series pedals, the Foxgear Knee Trembler measures only 2.3” x 4.7” x 1.1”, and can easily fit any pedalboard. Constructed with completely screw-free housings, the Knee Trembler features an acrylic face plate that lights up and glows warmly once connected to power, and comes with a limited 5 year warranty.


  • Power In 9 to 12VDC (negative TIP)
  • Consumption at 9V <100mA
  • Input Impedance <=1M Ohm
  • Output Impedance <=10K Ohm
  • S/N ratio <90db
  • Distortion max 2%THD
  • Larghezza (Width) 60mm. (2,3”)
  • Lunghezza (Length) 120mm. (4,7”)
  • Altezza (Height) 30mm. (1,1”)
  • Peso (Weight) 0,2Kg. (0,4lbs)


  • SPEED: Set the speed of the LFO
  • LEVEL: Set the level of the effect 

The Knee Trembler Offers a Wide Range of Tremolo Effects from a Slight Wobble to Wavey Psychedelia 

Built in collaboration with Pink Floyd's Guy Pratt, the Foxgear Knee Trembler tremolo has a huge range of action. The Knee Trembler’s easy to use controls allow you to add a range of tremolo effects from slight wobbles in your guitar signal to large waves of movement. If you’re looking for great, wavey, psychedelic tones for your guitar or bass, you can access them all with ease using this well-built Foxgear tremolo pedal.