Midi Stroke v0.0.2

Midi Stroke 0.0.2

Generators for every instrument, and a way to hear them.

🎷 Jazz scale generator (Saxo). Bebop scales, melodic-minor modes,
symmetrical and blues scales in any concert key, engraved in written pitch for
your horn — alto, tenor, soprano or baritone — across its full keyed range.
Scales in thirds, digital patterns, triad pairs, chromatic enclosures, and jazz
articulation that slurs the offbeat in and accents the leaps.

🥁 Pattern generator (Drums). A 16-step sequencer: pick the kit, say how
many times each voice hits in the bar, and let Euclidean (Bjorklund),
metric-weighted Bernoulli, a shift-register Turing machine, a time-dependent
Markov chain or a Wolfram automaton place them. Accents and velocities come
from 1/f pink noise; later bars vary instead of repeating.

Drums sound like drums. Pads play a synthesized twelve-voice kit instead of
the piano sampler — velocity-sensitive, with a hi-hat that chokes. Nothing to
download, and it works offline.

Playback, in sound or in MIDI. Every builder has a ▶ Listen button, and the
transport can sound the score as it scrolls — on the app's own instrument, or
sent to a MIDI output for your synth or DAW (drums as General MIDI pads on
channel 10).

Everything this release ships, in detail:
CHANGELOG.
User guide: ms.vibetuned.com.

Install

brew install --cask vibetuned/tap/midi-stroke   # macOS

Debian and Ubuntu have a signed apt repository, and there is an AppImage for
everything else — see the desktop page.
Or grab the dmg, installer, deb or AppImage below: the macOS build is a signed
and notarized universal binary.
We still not have a signed windows version but you can download the unsigned binary here

Midi Stroke v0.0.1

0.0.1 — 2026-08-30
The first release: the complete four-instrument training suite as a web app (ms.vibetuned.com/app) and as a desktop app for macOS, Windows and Linux. Validated on all three platforms before tagging.

The instruments
🎹 Piano — grand-staff training with hand selection (L / R / both), key-range calibration (the virtual keyboard only draws keys you have), a sticky clef strip, a seekable minimap with wrong-note markers, and a full virtual keyboard that glows the expected keys per hand.
🥁 Drums — finger-drumming patterns on a percussion staff, built for the Yamaha FGDP-50: looping playback, MEI-to-pad MIDI mapping, and a step-sequencer grid that tracks the playhead column by column.
🎷 Saxo — single-voice melodic training for wind controllers (built for the TravelSax): the score engraved transposed for E♭ alto, a full-key fingering chart that glows keys to press and reddens keys to release, a live breath meter (CC 2/7/11 + channel pressure), and a mirror toggle.
🎼 Theory — a course player pairing lesson videos with fill-in-the-blank worksheet exercises rendered as real engraved scores: you write music (from the clickable piano, the circle-of-fifths wheel, or a MIDI keyboard), then check, reveal, or listen. Ships with the Elementary rudiments and Notation courses; per-exercise progress and watched-video state persist locally.
The engine
Verovio → Pixi.js score pipeline: SMuFL-compliant engraving from MEI, rasterised into textures and scrolled on a WebGL canvas for frame-accurate playhead tracking. Tone.js drives the transport, metronome, and instrument synthesis (piano samples download on first use).
Two game modes on every piece — Rhythm (play along in time, scored with hit/miss windows) and Practice (playback pauses on each note group and waits for the correct notes — chords included).
Tempo control and seeking — slow-motion drills to full speed, with per-song accuracy, combos and history persisted locally.
Bring your own scores — load a single MEI file, or import a ZIP of MEI scores as a permanent on-device collection (browser OPFS, offline-capable, deletable). A one-beat count-in measure is injected at load time when missing, so scores need no preparation.
Optional score server — a small self-hosted Node companion (server/, Express + built-in node:sqlite, no build step) that stores MEI collections by instrument and category; the song selector connects, browses, caches for offline, and uploads into new or existing categories.
PWA — the web app installs and auto-updates; scores, stats and imports live on-device.
The scale generator (piano)
Technique exercises in all 24 keys, engraved on demand — no score files: pick a key on the circle of fifths (natural / harmonic / melodic for minors) and one of eleven forms: parallel and contrary motion, scales in thirds / sixths / tenths, scale triads, triad inversions, broken triads, tonic and dominant-seventh arpeggios, and cadences (I–IV–V7–I) — in quarters, eighths, sixteenths or triplets, over 1–4 octaves, with optional repeats.
Conservatory fingering engraved on the staff (toggleable) and a live preview before starting. The exercise URL is its stable identity, so precision history accumulates per key/form like any piece.
As a practice guide, the virtual keyboard grays out keys foreign to the exercise's key (they stay playable).
ROLI hardware light guide
With a ROLI Piano / LUMI Keys connected, expected notes also light up on the physical keys (per key, octave-accurate, chords included), by mirroring the guide as note-on/off to the device — established with a hardware probe (src-tauri/examples/lumi_probe.rs) after the reverse-engineered SysEx protocol turned out to only move the root pitch class. Scale exercises additionally paint the exercise's key across the whole keyboard (SysEx root + scale).
The device wipes a guide light itself when you press and release that key, so the guide re-sends the note-on after release — repeated notes and common tones between chords light up again instead of staying dark.
The desktop app (Tauri)
The same trainer with native MIDI (midir: CoreMIDI / WinMM / ALSA) — no Web MIDI needed, so it runs where browsers can't, and hot-plugging devices just works. Full 3-byte messages stream to the trainer: velocity for piano/drums, breath CCs and channel pressure for saxo.
Distribution: signed + notarized macOS universal dmg (brew install --cask vibetuned/tap/midi-stroke), Windows NSIS installer (winget install Vibetuned.MidiStroke), Debian package via a signed apt repository, and an AppImage — all built by CI from a version tag and attached to the GitHub release.
Platform behaviours probed for this release
Linux/WebKitGTK form controls: the popup is drawn on the GTK side (tauri#11755) — white default background plus the app's inherited white text. Fixed app-wide with appearance:none + color-scheme:dark + explicit option colors and an SVG chevron. Linux/WebKitGTK SVG filters: filter: invert(1) is not applied to SVG elements, which left the circle-of-fifths hub engraving black on black; the engraving is now recolored with plain CSS fill/color. ALSA MIDI loopback: midir gives every output connection a readable client port, so a connect-everything input bridge reads its own key-light stream back as key presses (practice mode advanced by itself). The desktop shell now skips its own ports everywhere (src-tauri/examples/loopback_probe.rs demonstrates the loop); verified against the real device that the ROLI itself does not echo.