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Midilab JC303 product image

Midilab JC303

Free

a complete emulation of the TB-303’s sound engine, with the added bonus of a continuously variable waveshape from sawtooth to square.

Added to the directory: 2024-01-17
Prices and requirements can change. Check the developer’s page before downloading.

What it does.

Open303-based TB-303 emulation with GuitarML overdrive and Devilfish-inspired modifications. Includes an acid-style step sequencer with accents, slides and ties.

Before you install.

Availability
Free
Operating systems
Windows, macOS, Linux
Plugin formats
VST, VST3, AU, CLAP, LV2
Review status
Developer details reviewed; not personally tested
Last information review
2026-10-06

Download & installation notes

Choose OS ZIP, extract and copy desired formats to plugin folders; developer documents macOS quarantine handling.

Source for these details ↗

See it in action.

Independent demo / walkthrough — Elektronick Musick. Free Synth - JC-303 by midilab (No Talking)

Watch the video ↗
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