The HeadRush Auto Wah is an auto wah / envelope filter effect from HeadRush, offered as a Stompbox in the ReValver range1. An envelope filter, often called an auto wah, moves a filter up and down in response to how hard you pick, producing the vowel-like "quack" players usually get from rocking a wah pedal by foot, but hands free.
HeadRush describes the Auto Wah as "Based on a Mu-Tron® III Envelope Filter"1. The Mu-Tron III is the circuit most often named when players talk about the origin of the envelope filtered sound, so the model points to that style of dynamic, pick-sensitive filtering rather than a foot-controlled sweep.
"Based on a Mu-Tron® III Envelope Filter"
The Auto Wah is presented as a stompbox-style effect within the ReValver range, not a physical floor unit1.
If you are comparing it with other filter effects, see Filter Pedals for the wider category, where foot-controlled wahs, fixed filter effects and envelope-driven designs sit side by side. Related envelope-driven designs in that category include the Electro-Harmonix Q-Tron and the Maxon AF-9 Auto Filter.
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Questions
What is the HeadRush Auto Wah based on?
HeadRush describes the Auto Wah as based on a Mu-Tron III Envelope Filter. The Mu-Tron III is the circuit many players associate with the original envelope filtered wah sound, where the filter opens and closes according to how hard the strings are picked rather than being moved by foot.
Is the HeadRush Auto Wah a pedal or a plugin?
HeadRush lists the Auto Wah among its Stompboxes on the ReValver product pages, so it is presented as a stompbox-style effect within the ReValver range rather than a physical floor unit.
Sources (1)
- HeadRush Auto Wah product page, HeadRush (revalver.headrushfx.com), 2026
