DOD 440 Envelope Filter



  • Sens./Level
    Compensates for different instrument input levels and adjusts the level at which the filter begins to sweep. (this knob is called Sens. on red and blue versions, "Level" on the green versions)
  • Range
    adjusts the lowest frequency that the filter settles back to as the input signal decays. If the Sensitivity Control is turned counter clockwise the Range control can manually adjust the filter frequency, like putting a wah pedal in a fixed position for tone coloration.


used by Johnny Greenwood of Radiohead.

the manual

The DOD Envelope Filter 440 is a Band Pass Filter that can be swept across a portion of the audio range producing a wah wah like effect.

About the colors:

    1977: Red version, wires soldered to circuit board, components facing up.
    1979: Green version, wires soldered to circuit board, components facing up.
    1981 (week 1-12): Blue version, wires soldered to circuit board, components facing up.
    1996: Green reissue with "printend circuit board, wires connected with a pin connector, components facing down.

DOD (June 2014)

That’s right, we know how you like it.  The DOD 440 (2014) makes your guitar speak with vowel-like sounds, and cry with slow-filter sweeps that react to your pick attack.  The new addition of the up and down switch lets you choose which part of the sweep you want to emphasize.  Guitarists will love the “UP” setting for classic envelope quack.  Bassists will love the “DOWN” setting for big dub sub thunder.  The 440 is back and the neighborhood will never be the same.

The DOD Envelope Filter 440 (2014) has Level and Range controls. Level controls the sensitivity of the envelope; adjust this control to tailor the triggering of the filter based upon your pick attack.  With a higher sensitivity, a lower signal will affect the envelope’s effect. In other words, with a higher sensitivity you don't have to pluck as hard to make the effect audible.  Range controls the range of movement of the envelope’s sweep. Counter-clockwise sweeps more low frequencies.  Clockwise sweeps more high frequencies.  The Voice switch allows you to choose which part of the filter sweep you want to emphasize.  True bypass allows your guitar tone to remain pristine even when the new DOD 440 (2014) is off.  This is a big difference from the original which would color your bypassed tone. The modern 9V DC power supply input make the pedal more pedalboard friendly.


  • Classic funky quack or swept filter tones that react to your picking dynamics
  • New Up/Down switch allows you to choose which part of the sweep to emphasize
  • True bypass
  • 9V DC power supply jack
  • Crisp blue status LED
  • Lighter aluminum chassis


myFXDB user reviews

1 review, average score of 8.5 / 10

2015-11-128.5/10  ......

Most recent forum threads


  • Input Impedance
    Red version: 150K ohms
    Green reissue: 4M ohms
  • Output Impedance
    Red version: 100K ohms
    Green reissue: 100K ohms
  • Maximum Input Level
    Green reissue: 6 V
  • Frequency response
    Red version: 40Hz to 20KHz
  • Sweep Range
    Red version: 50Hz to 5KHz
  • Battery Drain
    Red version: 1.5 ma
  • Power Supply
    9 V


Where to find one?

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envelope-controlled envelope follower amplitude controlled fx pedal stompbox stomp box guitar effects pedal filter eq/excite/filter bandpass bp bpf band-pass filter diy
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