Synth-80

{See video at top of page}

The world's first* full-fledged Roland MKS-80 Rev.4 emulator — and you can play it in your browser right now.

Synth-80 runs on WebAssembly, which means the actual synthesizer engine — not a video, not audio demos — is embedded in the product page itself. Open the page, move the knobs, play the keyboard, and A/B-switch between recordings of a real MKS-80 and the plugin rendering the same MIDI performance live in your browser:

https://jun-murakami.web.app/synth-80

The world's first serious MKS-80 Rev.4 emulation*
The Roland MKS-80 SUPER JUPITER (1984) hides in the shadow of the JUPITER-8, but this 8-voice analog poly has a rare trait: nearly every parameter is MIDI-controllable. That made it the perfect research subject. I built over 100 dedicated automated measurement programs covering every circuit and parameter of an MKS-80 Rev.4, then tuned the DSP by ear over a long-term, side-by-side development process — drawing on 25+ years as a professional composer and music producer. On many patches, you simply cannot tell which is hardware and which is software: from the delicate filter behavior down to the IC-derived character of the noise oscillator.

A deliberately simple UI

Inspired by Daichi's Synth1, every parameter lives on one screen — no menu diving, no bloated mod matrix. Hover over any parameter and the connected modules light up, showing you exactly how the signal flows. It's a synth designed to make sound design easy and fun, especially for beginners.

Effects worth using on their own
Four completely different chorus models (JUNO-60/106-style, Dimension D-style, Eventide-inspired pitch chorus, and a deep digital chorus), plus Hall/Plate/Room reverbs and a ZeroComp-based compressor. The entire rack is also included as a standalone effect plugin, Synth-80 FX.

Fair warning: this is not a lightweight synth. The modeling is deep and the CPU cost is real — try the demo in your DAW before buying. We promise the sound is worth it.

* Based on the developer's own research.

Features:
- World's first* faithful emulation of the Roland MKS-80 Rev.4
- Playable instantly in your web browser (WebAssembly) — no install needed
- Built from 100+ automated measurement programs analyzing every circuit
- All parameters on one screen; hover-highlighting shows signal flow
- 4 independent chorus models + reverb, delay, EQ, compressor
- Includes Synth-80 FX — the effect rack as a separate plugin
- Editor & librarian for MKS-80 hardware (bulk dump, bank builder)*²
- 120+ factory presets
- Standalone / VST3 / AU / AAX (64-bit), Win 10+ / macOS 11+ (M1 native)
- Key-file licensing with offline activation.

*² Due to the hardware's MIDI-output spec, the MPG-80 cannot be used as an editor for this plugin.

Release: June 26, 2026