The MXR Auto Q (Model M120 for guitar, M188 for bass) is a dynamic envelope filter and auto-wah pedal that gives you expressive, filter-based effects without needing a traditional treadle wah.

Key Features

• Versatile Filtering: Combines traditional auto-wah and envelope filter tones, ranging from subtle sweeps to deep, resonant, and funky textures.
• Amplitude-Independent Triggering: Unlike older envelope filters, it triggers reliably at any playing level, delivering the exact same sweep regardless of whether you are playing softly or loudly.
• Shimmer Effect: Features a unique variable shimmer effect that mixes in a flange-like LFO (Low-Frequency Oscillator) texture with your auto-wah signal.
• Intuitive Controls: Includes dials for Volume, Decay, Q (filter resonance), and Range to intricately shape your sweep, along with a Blend knob to mix your wet and dry signals.
• Built for the Stage: Housed in MXR's indestructible zinc/metal casing with glow-in-the-dark graphics and control stencils for dark venues.