# Note by Note

> Practice music with pitch, speed, loops, and snippets on any audio or video.

Canonical page: [https://chrome-stats.com/d/note-by-note](https://chrome-stats.com/d/note-by-note)

## Overview

- **ID:** `note-by-note`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** Note by Note
- **Category:** photos-music-videos
- **Daily users:** 33
- **Weekly downloads:** 55
- **Rating:** 5.00 / 5 (1 ratings)
- **Version:** 1.0.3
- **Last updated:** 2026-08-25
- **First published:** 2026-07-29
- **Size:** 6.36 MB
- **Data as of:** 2026-09-03
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/note-by-note/)
- **Website:** [https://github.com/patrickiel/note-by-note/issues](https://github.com/patrickiel/note-by-note/issues)
- **Privacy policy:** [https://addons.mozilla.org/firefox/addon/note-by-note/privacy/](https://addons.mozilla.org/firefox/addon/note-by-note/privacy/)

## Description

Note by Note turns any audio or video in your browser into a practice tool.

It opens in the sidebar and processes the page's audio in real time, so you can drop a song into your instrument's key, slow a solo to half speed without the chipmunk effect, and loop four bars until they stick. YouTube lessons, backing tracks, streamed albums, or an mp3 on your own disk — if it plays in the browser, you can practise along with it.

<strong>Pitch and speed</strong>
<ul><li>Transpose ±12 semitones, or ±36 with extended range turned on. Speed is untouched.</li><li>Fine-tune in cents, or pin playback to a reference pitch if you're playing with a group tuned to 415 Hz instead of 440.</li><li>Speed runs from 25% to 200% and leaves pitch exactly where it is.</li><li>Pitch shifting and time stretching come from the Rubber Band Library's realtime R3 engine, compiled to a WebAssembly AudioWorklet — the same algorithm used by desktop audio software.</li></ul>
<strong>Practice structure</strong>
<ul><li>Drop markers on the timeline as you listen, and set a loop range between any two points.</li><li>Click a marker tile to loop its section; drag across tiles, or shift-click a second one, to loop everything in between.</li><li>Add a count-in so you're not scrambling on the downbeat of every repeat.</li><li>Save any loop as a snippet, then chain snippets into a sequence: play the solo four times at 50%, then three times at 75%, then twice at full speed — without touching the panel between passes.</li></ul>
<strong>Sound</strong>
<ul><li>A vocal reducer (STFT centre-cut, written for this project) pushes the centre-panned voice down so the band comes forward — or inverts it to isolate the vocal instead.</li><li>A 10-band EQ with saveable presets, plus built-in curves that lean the mix toward guitar, bass, drums or vocals.</li></ul>
<strong>Chords</strong>
<ul><li>Optional chord and key detection runs a machine-learning model over the audio, entirely on your machine, and draws a chart under the timeline.</li></ul>
<strong>Keeping your place</strong>
<ul><li>Markers, loops, snippets and effect settings are saved per track against the page URL, so reopening a video brings your practice setup back with it.</li><li>Favourites and recently practised tracks live in a library tab.</li><li>Optional cross-device sync copies that setup to your other browsers.</li></ul>
<strong>How it connects</strong>

Nothing is requested when you install it. The first time you press Connect, the extension asks for site access once, rather than interrupting you on every new site. Settings → Revoke Permissions takes it back at any time.

Most pages attach directly: a Web Audio graph on the page's own audio or video element, with the full feature set. This is the YouTube path. A few pages block that — DRM-protected streams, cross-origin media, or a strict content-security policy — and the panel says so instead of half-working. Settings → Play local file opens a player for files on your disk, where nothing is restricted.

<strong>Privacy</strong>
<ul><li>No telemetry. No analytics. No ads. No accounts. Nothing is sold or shared.</li><li>Audio never leaves your device. Every effect — pitch, speed, vocal reduction, EQ, chord detection — runs locally in your browser.</li><li>Cross-device sync is the only network request the extension ever makes. It is on by default and can be switched off in Settings, and it carries no audio: just your settings, markers, loops, snippets, and the page URLs and titles of the tracks in your library.</li><li>Full policy: <a href="https://prod.outgoing.prod.webservices.mozgcp.net/v1/4a89352f741423bdfc3ea8c486d60376e2a8d02dcb9c95c01079da43df3c6514/https%3A//github.com/patrickiel/note-by-note/blob/main/PRIVACY.md" rel="nofollow">PRIVACY.md</a></li></ul>
<strong>Open source</strong>

Note by Note is free software under the GPL-2.0-or-later. The complete source, including the audio engine, is at <a href="https://prod.outgoing.prod.webservices.mozgcp.net/v1/c9b4f2d50c645a0518d41a247a448f576dab4500cb91901327f29aa58c4d8124/https%3A//github.com/patrickiel/note-by-note" rel="nofollow">github.com/patrickiel/note-by-note</a> — bug reports and contributions welcome.

Requires Firefox 140 or later. The sidebar is desktop-only, so Firefox for Android is not supported.

## Rankings

- #19,386 — Overall
- #20 — note

## Permissions and access

### Permissions

- `storage`
- `activeTab`
- `scripting`
- `tabs`

## Safety

- **Risk impact:** Moderate risk impact
- **Risk likelihood:** High risk likelihood

### Analysis details

- Grants access to browser tabs, which can be used to track user browsing habits and history, presenting a privacy concern.
- This extension was recently updated in the past month. New updates may not be stable or safe.

> Some risk analysis details are omitted from this free response. [Upgrade to view the full analysis](https://chrome-stats.com/pricing).

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Source: [Chrome-Stats](https://chrome-stats.com/d/note-by-note)