DOD FX25B Envelope Filter

The DOD FX25B Envelope Filter is an analog envelope filter pedal, an auto-wah effect that sweeps a filter in response to how hard you play¹. RockBoard's PedalPedia describes it as the reincarnation of the original FX25, with one addition: a blend control that makes the pedal equally responsive to both guitar and bass guitar¹.

What it does

An envelope filter, also called an auto-wah, moves a filter automatically with your playing dynamics rather than with your foot, producing the vowel-like "wah" sweep associated with a wah pedal without rocking on a treadle². JHS Pedals, in a history of a Y2K-era pedalboard, described it plainly: "an envelope filter, which is an auto-wah effect"².

DOD's own description of the FX25B explains the blend control that sets it apart from the earlier FX25¹:

That blend control matters for bass players: many envelope filters track guitar signals well but lose sensitivity on bass, and DOD positions the FX25B as working on both instruments¹.

Power and practical notes

The FX25B runs on a 9V DC, center negative supply and draws 10 mA, which is light enough for almost any pedalboard power supply¹.

Where it sits in DOD's filter line

The FX25B is the updated version of the original DOD FX25 Envelope Filter, with the blend control as the added feature¹. DOD's filter line also includes the Envelope Filter 440, a separate auto-wah design in the company's range¹.

Players

JHS Pedals' author recalled buying the FX25B for his board around 2000 for a specific reason: "I bought the DOD FX25B because Jonny Greenwood used it." He placed it last on that Y2K-era board².

Videos

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