Pre-Order Deposit MXR MB301 Bass Synth

Designed with low-end professor and tone connoisseur Ian Martin Allison, the MXR Bass Synth is a powerhouse of a pedal offers thunderous sub-octave, expressive envelope, and lush modulation effects with killer tracking and sustain—plus all the features you need to shape every detail of your tone.

INVENTORY UPDATE. We have 2 confirmed shipments. The first shipment arrives 17/04 and we can supply all orders placed before 27/11/2025 upto and including order number 39084. If your order number is higher than 39084 you will recieve stock off our follow up shipment that has shipped and has an eta of May 30th. 

New Orders placed as of 10/04/2026 will also be supplied off the May 30 shipment. 

any questions feel free to use the TXT system on our website

Key Features:

• Sub Mix, Mod & Envelope Controls: Shape your tone from smooth sweeps to bold pulses.

• Voice & Shape Buttons: Add harmonics and choose triangle, sawtooth, or square waveforms.

• Mix, Cutoff & Resonance: Dial in the perfect filter and dry/wet blend.

• 8 Classic Presets: Instantly access tones inspired by hits like Thriller and Chameleon.

• Advanced Options: Stereo mode, preset cycling, external control, and more.

From church gigs to big stages, the MXR Bass Synth delivers vintage vibes and futuristic funk.

This pedal requires a 9-volt (330 mA) center-negative power supply and can be powered by the Dunlop ECB003 9-volt adapter or the MXR Iso-Brick, the Iso-Brick Pro, and the Iso-Brick Mini Power Supplies. This pedal cannot be powered by a battery.

 Controls:

• VOICE Button Adds harmonically tuned oscillators for more complex tones

• CUTOFF Knob Sets the 4-pole resonant low-pass filter’s cutoff frequency

• MIX Knob Sets the mix between dry and synth signals

• SUB MIX Knob Blends between the main synth signal and sub-octave

• JACKS
  Input: Mono
  Output: TRS jack for stereo output
  CTR: Expression/tap input or right-channel output

• Power: 9VDC center-negative, 330mA

• FOOTSWITCH
  Tap: Engage/bypass effect
  Hold: Scroll through presets (tap to cycle, hold again or wait to exit)
  Freeze Note Hold footswitch + turn RESONANCE knob fully clockwise to activate Hold footswitch to freeze the current synth noteTo disable, hold footswitch + turn RESONANCE fully counterclockwise

• SHAPE Button – Selects oscillator waveform: 
  Triangle: Subtle and smooth 
  Sawtooth: Rich and aggressive
  Square: Fat, rubbery punch

• ENVELOPE Knob Controls filter envelope attack/decay
  Fully counterclockwise = envelope off

  Lower = fast, plucky response
  Higher = slow, sweeping effect

   

• MOD Knob Sets modulation depth

• RESONANCE Knob Boosts gain at the cutoff frequency for sharper, more expressive tone

• PRESETS Button Selects from 8 built-in presets