x0xb0x

5.0 (15)

3 Reviews

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Mode Machines x0xb0x mkII

4.0 (1)

Find out who is using x0xb0x

1 community setup

7 wishlisted

35 saved

Page last updated Nov 01, 2025

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Description

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The x0xb0x is a beloved synthesizer that brings the iconic sounds of classic analog bass synthesis to your fingertips. Designed to faithfully replicate the legendary TB-303, this synth is revered for its ability to produce rich, resonant basslines and squelchy, acid-infused tones. With its authentic analog circuitry, the x0xb0x captures the essence of electronic music’s formative years, making it a must-have for both seasoned producers and synth enthusiasts.

Equipped with a user-friendly sequencer, this synthesizer allows you to create intricate patterns and grooves with ease. The x0xb0x also features MIDI and USB connectivity, ensuring seamless integration with modern setups. Its intuitive interface includes controls for tuning, waveform selection, and modulation, empowering you to sculpt your sound with precision. Whether you're crafting hypnotic acid lines or deep, pulsating basses, the x0xb0x delivers a sonic experience that is both nostalgic and compelling.

Perfect for live performances or studio sessions, the x0xb0x offers a durable and compact design, making it a versatile addition to any setup. Dive into the world of acid house and techno with this tried-and-true synthesizer that continues to inspire musicians across genres.

Key Features:

Authentic analog circuitry for classic bass and acid sounds
Integrated sequencer for pattern creation
MIDI and USB connectivity for modern integration
Intuitive controls for sound sculpting
Compact design suitable for live and studio use

Videos

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Yo!

Daft Punk Tron End Titles Pattern (x0xb0x/TB-303)

Yo!

The Definitive Roland TB-303 vs Adafruit x0xb0x shootout

phono1337

x0xb0x - Famous TB-303 Patterns

AntiProtonBoy

Roland tb-303 vs. x0xb0x Comparison

roxxx303

Reviews

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PROS

Authentic TB-303 sound replication
Offers enhancements like bass boost
Build-it-yourself kit educates on electronics
Sound quality varies with builder skill, offering customization
Available in durable aluminum case
Compatible with both base and MK2 versions

CONS

Resonance pot may be flakey, requiring replacement
Sound quality inconsistent, dependent on builder's skill

Owner Insights

We analyzed real musician discussions from forums and Reddit to find what players love, question, and tweak about x0xb0x.

Setup and maintenance

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Aluminum 'PCB' panels can be utilized for faceplates, which can be custom-designed using PCB CAD programs for precise fit and finish.
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The Murata ceramic resonators differ in load capacitance from the ABRACON, potentially affecting clock performance.
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The tact switches on the x0xb0x tend to wear out quickly and replacements are hard to find, impacting usability over time.
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Other

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Willzyx and Reverb are reliable sources for rare parts, with some components also available through LCSC and Digikey.
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The main weak point internally is the sequencer to main board connector, which can vary in reliability depending on the builder's skill level.
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User experience

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Murata ceramic resonators were used successfully despite different specs, suggesting flexibility in component choice.
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Features and functionality

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The x0xlarge CPU offers enhanced sequencing capabilities and compatibility with custom faceplates for n0nx0x OS.
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The x0xb0x offers a superior sequencer compared to the original TB-303 or Behringer TD-3, allowing for non-destructive slides, accents, and rests during performances.
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Mods and upgrades

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Alps SKQEAAA010 switches are recommended, with compatible caps available from Alibaba, requiring a minimum order adjustment.
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The J113 transistor is recommended as a practical substitute for the harder-to-find 2SK30 JFET used in x0xb0x builds.
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The Behringer TD3-MO is highlighted as a competing option with built-in patchpoints and mods, offering a different modding experience due to its cleanly laid out plastic enclosure.
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Build quality

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The knobs listed in the x0xb0x BOM do not fit the specified pots, requiring alternative knob options.
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The lack of ICP programming pins on the x0xb0x PCB complicates flashing the CPU chip, requiring direct connection to the chip for programming.
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The resonance pot on the x0xb0x is prone to becoming scratchy, which can affect sound quality during performance.
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Comparisons

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Some builders prefer the x0xb0x for the hands-on experience of hunting components and assembling, despite easier alternatives like the Behringer TD-3.
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Use cases and applications

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For those interested in DIY synthesis but lacking Eurorack systems, the x0xb0x provides a standalone building experience, despite parts becoming harder to source.
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Utilizing random mode is a quick method to test all pots as it plays random notes, ensuring functionality before purchase.
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Software and compatibility

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The x0xlarge CPU offers a versatile upgrade, allowing original firmware reloading through USB or MIDI, enhancing the functionality of the x0xb0x.
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5.0 out of 5

Based on 3 Reviews and 15 Ratings

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jonnay

over 10 years ago

I wrote the d0x on it.

I taught myself electronics on this machine.

And this machine is great. Okay, okay, okay, the resonance pot is a little flakey, but you can get a new one. But this is—analogishly speaking—a TB-303. Whenever the original transistors are not available, ones that are very close are used instead.

And you can tell. As in, you can't tell it apart from a TB-303.

I liked it so much, I got another one.

x0x #28

engineeermusic

415

over 10 years ago

Amazing Acid machine

I got the X0xbox with aluminum case and atomic mods off eBay. Sounds really good and the bass boost adds more to the bottom end. There are differences on how a X0xb0x sounds depending on who built it. I guess I got lucky to get a really good one. If you can't afford the original TB-303, the X0xb0x is an amazing alternative.