Texed

Browser-based FM synthesizer and patch editor: emulates Yamaha DX7, DX7II, TX802, and TX816-style multi-timbral setups (eight parts, performances, up to 128-voice polyphony).

Live demo: https://woutervannifterick.github.io/texed/

Quick start

1. Open the demo and click LET'S PLAY!
2. Play with the on-screen keyboard, QWERTY keys, or Web MIDI
3. Open the library or LOAD / drag-and-drop your own .syx patches

More detail: docs/using-texed.md. Hardware MIDI editor: docs/hardware-midi.md (?hw mode).

Comparison

feature	DX7	Dexed	DX7II	TX802	TX816	Texed
6 Op FM	✅	✅	✅	✅	✅	✅
Timbrality	1	1	2	8	8	8
Load Performances / Banks	❌	❌	✅	✅	✅	✅
Additional routing + modulation	❌	✅	✅	✅	❌	✅
Polyphony	16	16	16	16	128	128
MIDI-in Ports	1	1	1	1	8	all
MKI operator	✅	✅	❌	❌	✅	✅
MKII operator	❌	✅	✅	✅	❌	✅
Hardware/Software	Keyboard	VST	Keyboard	Rack	Rack	Web

Table notes: MKI / MKII operator = operator/engine behaviors matching DX7 Mark I vs Mark II family; Additional routing + modulation = performance-level routing beyond a single DX7 voice (splits/layers/mod matrix on supported gear).

Highlights

• Realtime editing and visualization on one screen
• Accurate envelope visualization, not a schematic. Envelope curves are computed by replaying the actual DSP envelope generator; drag segments to edit rate and level.
• Built-in patch library hundreds of factory and community banks (see docs/patch-library.md)
• Load/save patches cartridges and single-voice SysEx
• Web MIDI and QWERTY play; optional hardware editor over SysEx
• Session persistence patch and UI state in local storage
• Headless CLI render MIDI to WAV (docs/cli.md)

Background

Texed is a TypeScript/React port of Dexed (Pascal Gauthier and others). Dexed builds on MSFA (Raph Levien / Google, 2012).

Dexed plays one DX7 voice accurately but does not support performances patches that combine up to eight DX7 voices as layers, splits, and routed parts. Texed adds that multi-timbral model and a web-native editor.

Repository layout

Path	Contents
texed-ts/	App: React UI, DX7 engine/format packages, CLI host, tests
patches/	Factory and third-party voice/performance banks (.syx, etc.), packed into the built-in library at build time
docs/	User and contributor guides

Development

Requires Node.js ≥ 24 and pnpm (see texed-ts/package.json).

• Lint: oxlint, format: prettier, typecheck: tsc
• Tests: vitest (unit) and playwright (e2e), from texed-ts/
• CI (.github/workflows/ci.yml) runs lint, test, and build on every push and PR
• Deploy (.github/workflows/deploy.yml) publishes GitHub Pages on push to master

cd texed-ts
pnpm install
pnpm dev      # dev server (rebuilds patch library)
pnpm test     # unit tests
pnpm build    # production build
pnpm cli song.mid --syx bank.syx   # headless WAV render. See docs/cli.md

Architecture and editing controls: texed-ts/README.md. Contributing: CONTRIBUTING.md.

License

Texed inherits the Dexed lineage and is distributed under GNU GPL v3. Full license text: dexed-juce/LICENSE.

Bundled .syx data under patches/ is third-party/factory content. See docs/patch-library.md.

Support

Questions, bugs, and ideas: GitHub issues or a pull request (CONTRIBUTING.md).

Wouter van Nifterick