MXR MB301 Bass Synthesizer Effects Pedal

Quick Product Summary

The MXR MB301 Bass Synthesizer turns your bass into a powerful, expressive synth instrument, combining deep sub-octaves, responsive filtering and modulation with a flexible range of classic-inspired monophonic synth sounds. Developed with bassist and tone specialist Ian Martin Allison, it gives players everything from huge vintage-style synth bass to funky envelope sounds, pulsing modulation and aggressive electronic textures.

With eight ready-to-use presets alongside extensive hands-on controls, the MB301 works equally well for players who want instant stage-ready synth sounds and those who prefer to build their tones from scratch.

At A Glance

Feature	Details
Brand	MXR
Model	MB301
Type	Bass Synthesizer Effects Pedal
Condition	New
Synth Type	Monophonic Bass Synth
Waveforms	Triangle, Sawtooth & Square
Presets	8
Key Effects	Sub-Octave, Envelope & Modulation
Stereo Capability	Yes
Main Appeal	Powerful synth bass tones in a compact pedal
Best For	Funk, pop, rock, electronic, worship and experimental bass

What Makes the MXR MB301 Bass Synthesizer Special?

The MB301 puts a surprisingly deep synth engine into a familiar stompbox format. Its combination of sub-octave generation, envelope-controlled filtering and modulation allows you to create everything from fat analogue-style bass lines and rubbery funk sounds to sweeping filters, aggressive synth textures and huge low-frequency tones. Excellent tracking and sustain help keep the effect responsive to your playing rather than feeling disconnected from the instrument.

MXR has also made the pedal practical for live performance. Eight presets designed by Ian Martin Allison provide immediate access to carefully voiced synth sounds, while players who want greater control can dive into waveform selection, resonance, cutoff, sub level, modulation and additional secondary parameters. Expression pedal, external footswitch and stereo-output options make it equally comfortable in sophisticated pedalboard setups.

Who Is It For?

The MXR MB301 is ideal for bassists looking to add convincing synth sounds without carrying a separate keyboard or synthesizer. It is particularly effective for funk, pop, R&B, electronic music, progressive styles, worship, alternative music and any situation where traditional electric bass needs to cover keyboard-style low-end sounds.

It also makes an excellent creative tool for players who want to move beyond conventional bass effects. Whether you need a single dependable synth patch for a cover set or want to build unusual electronic sounds from the ground up, the MB301 offers plenty of room to experiment.

Why Choose a Bass Synthesizer Pedal?

A bass synth pedal transforms the character of your instrument while allowing you to retain the feel, phrasing and technique of playing an electric bass. Instead of switching to a keyboard for synth-heavy parts, you can generate electronic bass sounds directly from your normal instrument.

The MB301 goes significantly further than a simple octave or envelope pedal by combining several synthesis elements in one unit. Sub-octave, filtering, resonance, modulation and selectable oscillator shapes work together to create sounds ranging from subtle enhancement to complete synth-bass transformation.

Controls & Sound Shaping

Sub Mix

Controls how much sub-octave content is blended into the synth signal. Increase it for huge, room-filling low frequencies or reduce it for a tighter and more focused sound.

Mod

Introduces modulation into the synth tone, ranging from subtle movement to more obvious pulsing and animated textures.

Envelope

Adjusts the behaviour of the filter envelope, allowing you to move between fast, bouncy responses and slower sweeping effects.

Mix

Balances your dry bass signal with the processed synth sound, making it possible to retain natural bass definition or move towards a more completely synthesised tone.

Cutoff

Sets the filter cutoff frequency and plays a major role in determining whether the sound is dark and rounded or bright and cutting.

Resonance

Boosts frequencies around the filter cutoff point, creating everything from extra definition to highly pronounced, vocal-like synth sounds.

Voice

Adds additional harmonically tuned oscillators, increasing the complexity and size of the synth sound.

Shape

Selects between three oscillator waveforms:

• Triangle – smooth and rounded

• Sawtooth – rich, harmonically aggressive and cutting

• Square – full, punchy and powerful

Eight Built-In Presets

The MB301 includes eight factory presets designed by Ian Martin Allison, providing quick access to a range of classic-inspired synth bass sounds.

These cover everything from deep octave-driven tones and resonant funk sounds to heavier electronic and modulation-based textures. The preset system makes the pedal particularly useful on stage, where dramatically different sounds can be accessed without rebuilding settings between songs.

Players can also work directly from the current control positions when they want to create their own sounds.

Advanced Control

Beyond the main controls, the MXR Bass Synth offers access to additional parameters for players who want to go deeper into sound design. These include control over elements such as oscillator and modulation mix, compression and tracking behaviour.

The MB301 can also be configured for stereo output, while compatible external control options allow preset switching and expression-based manipulation of settings for more advanced live and studio rigs.

What’s Included?

• MXR MB301 Bass Synthesizer Effects Pedal

Technical Specifications

Specification	Details
Manufacturer	MXR
Model	MB301
Effect Type	Bass Synthesizer
Operation	Monophonic
Waveforms	Triangle, Sawtooth, Square
Presets	8
Main Controls	Sub Mix, Mod, Envelope, Mix, Cutoff, Resonance
Additional Controls	Voice, Shape & Preset
Sub-Octave	Yes
Envelope Filter	Yes
Modulation	Yes
Dry / Effect Blend	Yes
Stereo Output Capability	Yes
External Control Support	Yes
Expression Control Support	Yes
Power Requirement	9V DC, centre-negative
Current Draw	330mA
Battery Operation	No
Manufacturer Part Number	MB301

Power Requirements

The MXR MB301 requires a regulated 9V DC centre-negative power supply capable of supplying at least 330mA.

The pedal cannot be powered by a battery, so a suitable external power supply is required for operation.

FAQs

What does the MXR MB301 Bass Synthesizer do?

It converts your bass signal into monophonic synthesizer-style sounds using octave, oscillator, filtering, envelope and modulation processing.

Is the MB301 designed specifically for bass guitar?

Yes. It has been developed specifically around bass performance and is designed to retain strong low-frequency response while providing responsive synth tracking.

Does the MXR MB301 have presets?

Yes. It includes eight built-in presets, allowing you to access a selection of ready-made synth sounds quickly.

Can I create my own synth sounds?

Yes. The extensive front-panel controls allow you to shape the oscillator character, filter, resonance, envelope, modulation, sub-octave and dry/effect balance.

Which waveform shapes are available?

The MB301 provides triangle, sawtooth and square waveforms, giving you three distinctly different starting points for creating synth tones.

Can I mix my normal bass sound with the synth effect?

Yes. The Mix control allows the dry bass signal and processed synth sound to be blended together.

Can the MB301 produce sub-octave sounds?

Yes. A dedicated Sub Mix control allows additional sub-octave content to be blended into your synth tone.

Is it suitable for live performance?

Absolutely. The preset system makes it easy to move between different synth sounds, while external control options can provide additional flexibility for more advanced pedalboard setups.

Can I use an expression pedal with the MB301?

Yes. Compatible expression control can be used to manipulate configurations dynamically, adding another level of real-time control during performance.

Does it support stereo operation?

Yes. The MB301 can be configured for stereo output, making it suitable for more elaborate stage, studio and dual-amplifier setups.

Can it run from a 9V battery?

No. The MB301 requires an external 9V DC centre-negative power supply capable of delivering 330mA.

What styles of music is it best suited to?

It is extremely versatile, but its synth textures are particularly useful for funk, pop, R&B, electronic music, progressive rock, worship, alternative styles and modern production.

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