The MXR Bass Envelope Filter, model M82, is a compact and robust analog envelope filter designed specifically for electric bass. It offers classic funk-style auto‑wah tones while preserving your low-end integrity. Unique to this design are separate Dry and FX level controls—Dry mixes in clean signal to maintain bass thickness, while FX adjusts the amount of filtered effect, giving you full tonal control over the effect blend.
Below those are three shaping controls: Decay sets how far the filter sweeps down after attack (higher Decay yields shallower, tighter sweeps), Q influences sweep width and resonance (from subtle to pronounced), and Sensitivity (Sens) adjusts how easily your pick or finger attack drives the filter—perfect for tuning response based on playing dynamics or pickup output. This pedal runs on a 9 V battery (not included) or via a 9 V DC center-negative adapter (not included). It draws just 6 mA and offers true bypass switching to retain tone when disengaged. The compact aluminum housing fits neatly on any pedalboard.
Users frequently note that it delivers an unmistakable funk quack with minimal effort and excellent consistency across setups. It tracks well even at low dynamics and is praised for its ease of dialing in and reliability. Although it only offers upward swoops and no low-pass variants, it's exceptionally effective for bass players seeking tight, punchy, expressive filter effects.
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