# ryohey/signal

Online MIDI Editor: signal

Repository: https://github.com/ryohey/signal
Canonical: https://ross.abutalabs.com/products/signal
Homepage: https://signalmidi.app
Language: TypeScript
License: MIT
License Family: permissive
Topics: webaudio, typescript, react, midi, music, editor, audio
Last push: 2026-08-26T12:09:47+00:00

## Health v2 (maintenance only)
Score: 77/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 99, release rhythm 35, longevity 100
- inputs: {"age_days": 3832, "days_push": 7, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 2365, forks 247 (observed 2026-08-28T04:06:41.543539+00:00)

## What it is
Signal is an open-source online MIDI editor and music sequencer built with web technologies (TypeScript, React, Web Audio). It offers a multi-track piano roll editor with SoundFont playback, MIDI I/O, and WAV export, running entirely in the browser.

## Use cases
- sketch musical ideas in a browser-based MIDI editor
- edit MIDI files with a multi-track piano roll
- record performances from a MIDI keyboard in the browser
- export compositions as WAV files
- compose music without installing a DAW
- load custom SoundFonts for playback

## When to choose
- you want a lightweight, distraction-free tool for composing and sketching MIDI
- you need a cross-platform editor that runs in any modern browser with no install
- you want quick MIDI editing with tempo/time-signature changes and WAV export

## When to avoid
- you need professional audio production features like effects and high-quality sound
- you need a full DAW workflow for mixing and mastering
- you need offline desktop-native performance beyond PWA support

## Facets
- artifact type: application
- maturity: active
- function: editor, audio-processing, gui
- domain: media, web-development, developer-tools
- platform: browser, cross-platform
- tags: midi, music-sequencer, piano-roll, webaudio, soundfont, pwa, music-composition, web-server

## Member repositories
- ryohey/signal (main) score 77

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:06:41.543539+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T02:36:00.469109+00:00, confidence not recorded.
  - readme: https://github.com/ryohey/signal (fetched 2026-08-28T04:06:41.543539+00:00, sha 1379df2e69f9)
  - homepage: https://signalmidi.app (fetched 2026-08-29T10:16:44.771890+00:00, sha 7d1673519f39)
- Data as of 2026-08-30T08:39:29.467469+00:00.