Join

DOA303.

A little box.
A lot of acid.

FREE INSTRUMENTV1.1.2

A bassline machine from Design On Acid.
Built to squelch. Made to be played.

Get DOA303
DOA303 plugin with the official geometric DOA logo, blue-grey controls, red indicators and a 16-step sequencer
HEAR THE SQUELCH

A six-second phrase from the DOA303 engine. No external effects.

Turn it.
Tie it. Acid.

Inspired by the spirit of the 303. An original instrument for slippery basslines, sharp accents and late-night repetition.

01 / VOICE

Find the sweet spot.

Saw or square into a coupled diode ladder filter. Open the cutoff, push the resonance and let the envelope do the talking.

02 / ACCENT

Give it attitude.

Resonance shapes the accent sweep. Repeated accents build energy, while slides tie notes together without restarting the envelopes.

03 / OVERDRIVE

Make it bite.

Asymmetric overdrive runs inside the 4x engine. Go dark or open with Drive Tone, or turn Drive down for a clean signal.

04 / SEQUENCE

Get into a loop.

Sixteen steps. Pitch, octave, gate, accent and slide. Follow your DAW, run the internal clock, or play it straight from MIDI.

MONOPHONICHOST AUTOMATIONPROJECT RECALLNO SAMPLES

Your next
acid trip.

Free to download. No account, no activation, no subscription. Pick your operating system and make some noise.

DOWNLOAD macOSApple Silicon + Intel · VST3 / AU / StandaloneDOWNLOAD Windows64-bit · VST3 / StandaloneDOWNLOAD Linux64-bit · VST3 / Standalone

From download to bassline.

  1. Extract the ZIP. Choose the VST3, Audio Unit or standalone version included for your system.
  2. Copy the plugin. Place the VST3 bundle in the folder below. On macOS, the AU goes in ~/Library/Audio/Plug-Ins/Components/.
  3. Rescan and play. Open your DAW, rescan plugins and load DOA303 on a MIDI track. Start the transport or press RUN.

macOS / VST3~/Library/Audio/Plug-Ins/VST3/

Windows / VST3C:\Program Files\Common Files\VST3\

Linux / VST3~/.vst3/

macOS downloads are ad-hoc signed and not notarized. Your system may ask you to allow the plugin before loading it. Read the installation notes.

Design On Acid

Open it up.
Make it your own.

Original DOA303 code and artwork are released under Creative Commons CC0. Explore the engine, change the interface, or build something we haven't imagined.

JUCE keeps its own license. The combined plugin builds are distributed under AGPLv3, with license notices and corresponding source included in every download. DOA303 is an independent project, with no affiliation to Roland, Behringer, AudioRealism or D16.