Guitar Practice Helper

A static web app that turns the drill codes from my Obsidian practice wiki (R1, F2, T3, …) into interactive helper pages: click tracks, pattern grids, chord & fretboard diagrams, and a drone. Open a drill link from the wiki on phone or desktop, press play, practise for ~5 minutes. No accounts, no backend, no analytics.

Built with Svelte 5 + Vite as a fully static SPA. Music theory is powered by tonal. Timing uses a Web Audio lookahead scheduler so the metronome never drifts.

Develop

npm install
npm run dev        # local dev server
npm run check      # svelte-check (typecheck)
npm test           # vitest (scheduler timing + music-theory correctness)
npm run build      # typecheck + production build to dist/
npm run preview    # serve the built dist/ locally

Deploy

The build is fully static (dist/). Because the app uses path routing (clean URLs like /drill/R3), the host must serve index.html for unknown paths (SPA fallback), and the base path is baked in at build time.

Base path

• Dedicated domain / served at the root: default, base = '/'.
• Subpath (e.g. https://example.com/practice/): build with VITE_BASE=/practice/ npm run build.

Cloudflare Pages

Framework preset: none. Build command npm run build, output directory dist. public/_redirects (already included) provides the SPA fallback:

/*    /index.html   200

For a subpath, set the VITE_BASE environment variable in the Pages build settings.

Docker + nginx

A multi-stage Dockerfile (Node build → nginx:alpine) with the correct config (nginx/default.conf: SPA fallback via try_files, immutable caching for hashed assets, no-cache for the HTML shell, gzip):

docker build -t guitar-practice .            # root deploy
docker build --build-arg VITE_BASE=/practice/ -t guitar-practice .   # subpath
docker run -p 8080:80 guitar-practice        # http://localhost:8080

Existing nginx server

Serve dist/ and add the SPA fallback to your location block:

location / {
    try_files $uri $uri/ /index.html;
}

Deep-link URL format

The whole point — link to any drill directly from the wiki:

https://<host>/<base>drill/<CODE>

Optional query parameters override the stored/default settings:

Param	Applies to	Example
bpm	click-track drills	?bpm=66
variant	drills with variants	?variant=2-3-2
key	T2, T4	?key=D
root	T3, T5, T6, L4	?root=A
interval	T5	?interval=P5
mode	T6	?mode=dorian
pair	R4	?pair=g-c

Examples:

https://example.com/practice/drill/R3?bpm=66&variant=2-3-2
https://example.com/practice/drill/T6?root=A&mode=dorian
https://example.com/practice/drill/R4?pair=f-bm

Unknown codes resolve to a friendly “unknown drill” page linking back to the index (/ shows all drills grouped by category).

Drills

Code	Name	Helper
R1	16th-note strum, mute the off-beats	metronome + strum grid
R2	Accent patterns	metronome + strum grid
R3	7/8 loop (drop to 4/4 live)	metronome + strum grid
R4	One-minute chord changes	countdown + tap counter + chord diagrams
R5	Palm-mute chugging	metronome + strum grid
F1	Travis picking	metronome + picking lane + chords
F2	PIMA arpeggio over I–V–vi–IV	metronome + picking lane + chords
F3	Thumb-independent bass + melody	metronome + picking lane
T1	Name every note on one string	metronome prompter + fretboard
T2	CAGED shapes	fretboard, prev/next
T3	Triads on a 3-string set	chord diagrams, inversions
T4	Diatonic chords of a key	chord diagram row
T5	Intervals from a root	fretboard
T6	Mode over a drone	drone + fretboard
L1	Alternate picking builder	metronome + picking lane
L2	Legato runs (triplets)	metronome + picking lane
L3	String skipping	metronome + picking lane
L4	Bends and vibrato	reference tone
E1	Interval recognition	info
E2	Chord quality recognition	info
E3	Play along by ear	info + drone

Keyboard (desktop)

• Space — play / pause
• ↑ / ↓ — BPM ±2

Notes

• Audio unlocks on the first tap/keypress (mobile autoplay policy).
• Per-drill settings (BPM, variant, key, best scores) persist to localStorage under the gph: namespace.
• Screen Wake Lock keeps the phone awake while a click or drone is playing.
• Respects prefers-reduced-motion: the beat still advances, without the glow/swing.