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acidlab M303

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Page last updated Feb 12, 2026

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Description

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The Acidlab M303 is a modular synthesizer that faithfully recreates the iconic sounds of the original Roland TB-303. Designed for musicians and producers who crave that classic acid house vibe, the M303 delivers a rich, resonant bass that stands out in any mix. Whether you're creating tracks in a studio or performing live, the M303's authentic analog circuitry ensures your sound remains warm and organic.

The M303 is equipped with a comprehensive control panel that allows users to effortlessly tweak and shape their sound. Its intuitive interface features familiar controls like Cutoff, Resonance, and Envelope Modulation, alongside a sequencer that retains the intricacies of the original 303 pattern programming. The unit is designed to integrate seamlessly into any modular setup, offering extensive connectivity options, including CV/Gate inputs and outputs, which provide exceptional flexibility for sound modulation.

The Acidlab M303 not only pays homage to its legendary predecessor, but it also stands as a reliable tool for modern electronic music production. With its robust construction and meticulous attention to detail, this synthesizer is crafted for those who demand both quality and authenticity in their sonic explorations.

Key Features:

Authentic analog circuitry for classic 303 sound
Integrated sequencer with traditional 303 pattern programming
CV/Gate inputs and outputs for modular connectivity
Intuitive control panel with Cutoff, Resonance, and Envelope Modulation
Robust construction suited for both studio and live performance

Videos

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glumc

Acidlab - M303 - FM

glumc

Acidlab M303 jam1

nektar

Acidlab M303 sequenced with a Moog M32

Anaxander

Combo I Like: Acidlab M303 Feat 4ms Pingable Envelope Generator (for Eurorack Synth Acid Modulation)

Sound Provider / Leonard de Leonard

Reviews

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Owner Insights

We analyzed real musician discussions from forums and Reddit to find what players love, question, and tweak about Acidlab M303.

Features and functionality

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The M303 requires a high enough voltage to engage slides, separate from basic MIDI note and gate signals.
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Engaging the module requires a continuous CV in the accent input and proper tuning to find the right voltage range.
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Switching the module to VCA instead of gate and adjusting to square wave can help diagnose sound output issues.
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Setup and maintenance

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Users have found that using a Maths module to control voltage can successfully trigger slide functionality.
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A 10v gate signal is essential for adequate audio levels; weaker signals result in low output.
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The M303 may require warming up for 10 minutes for optimal performance and sound quality.
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Software and compatibility

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Yarns is used for MIDI to CV conversion, but additional voltage manipulation is necessary for full slide control.
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Use cases and applications

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To control slide intensity, attenuating voltage from a Maths channel directly impacts slide behavior.
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VC send to effects like reverb on accented notes can create a distinct sound for acid lines, adding texture and depth.
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Mods and upgrades

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Ritual Electronics Miasma is recommended for achieving a growling sound, ideal for acid lines, as showcased in the DivKid video.
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The Monotropa distortion module is praised for its harshness and refined saturation, making it suitable for intense acid sounds.
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A Rat or Rat clone is suggested for its compatibility with analog monosynths, providing a warm, analog distortion.
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Comparisons

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Viol Ruina by Noise Engineering is highlighted for its compact size and suitability for acid, with other Versio modules offering versatile firmware options.
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