Turn your bass into a filthy funk machine with the MXR Bass Synth. It serves up intergalactic grooves and vintage analog-style vibes with a range of monophonic synth tones that call back to hits from Stevie Wonder, Michael Jackson, Parliament Funkadelic, and more. Designed with low-end professor and tone connoisseur Ian Martin Allison, this powerhouse of a pedal offers thunderous sub-octave, expressive envelope, and lush modulation effects with killer tracking and sustain.

• VOICE button adds additional oscillators harmonically tuned 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 sets mix between the main synth and sub signals
• 5 JACKS – Input: Mono, Output: TRS jack; allows for stereo output, CTR: Expression/tap input or right-channel output
• POWER: The power jack requires 9 VDC, center negative at 330 mA
• FOOTSWITCH – Engage/bypass effect: Tap the footswitch Scroll presets: Hold footswitch. Tap footswitch to advance through presets. To exit, hold footswitch again or simply wait for timeout.
• Freeze current note: To configure freeze functionality, hold the footswitch down and rotate the RESONANCE knob to its max position. After configuring, holding the footswitch will hold or freeze the current synth note. To revert to preset scroll mode, hold the footswitch and rotate the RESONANCE knob to its min position.
• SHAPE button selects oscillator waveform: Triangle: Subtle and smooth, Sawtooth: Rich and aggressive, Square: Fat, rubbery punch
• ENVELOPE knob controls the attack/decay times of the filter envelope—lower settings give a fast, plucky response, while higher settings create a slow, sweeping effect. When fully counterclockwise, the envelope filter is off
• MOD knob sets the amount of modulation
• RESONANCE knob boosts gain at cutoff frequency, adding a sharper, more expressive effect at higher settings.
• PRESETS button selects one of 8 different presets