MXR MB301 Bass Synth Monophonic Synthesizer Effects Pedal

MXR's MB301 is a compact bass synth pedal that delivers rich, analogue-style synth tones without the hassle of a keyboard rig. Co-developed with Ian Allison, it captures everything from '70s funk squelch to gritty industrial leads. With eight onboard presets, powerful filter and modulation controls, and deep editing under the hood, it’s equally suited to quick jams or full-on sound design. Tracking is fast and stable—even on 5-string basses—and the layout is clean, pedalboard-ready, and built like a tank.

Features & Specs

• 8 user-adjustable synth presets

• Mix, Sub Mix, Cutoff, Resonance, Envelope, and Mod controls

• Switchable oscillator waveforms: triangle, sawtooth, square

• Secondary voice stacking with pitch detune

• Preset footswitch with scrolling and freeze function

• Expression input for filter, mod or preset control

• TRS stereo output, wet/dry routing

• 9V DC power (330mA draw, no battery support)

• 1MΩ input impedance

• 100Ω output impedance

• –97dBV noise floor

Requires a 9-volt (330 mA) centre negative power supply.

Video: https://youtu.be/WWm-AukbEpE

Product Specs

• Item Number: 38625
• Make: MXR
• Model: MB301 Bass Synth
• Condition: Brand New
• Finish: Grey
• Categories: effects-and-pedals ⇒ guitar-synths ⇒ pedal
• Function: Bass Chorus Dynamics Digital Dual/Stereo Filter Pitch Shifter Synth Voice
• Made In: United States
• MPN: MB301
• UPC: 710137141643
• Modular Grid: Pedals ⓘ ＋
• Dimensions*: 64 mm wide 110 mm high
• Power*: ? mA / ? V AC/DC

* User contributed details

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