MusicTools for YouTube por NDS
The only high-quality pitch shifter and speed controller for YouTube on Firefox. Change key, tempo, and speed independently — with vocal removal and real-time audio analysis. No uploads, no server, works instantly
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Metadata de la extensión
Sobre esta extensión
MusicTools is the only Firefox extension that gives you professional-grade real-time audio control directly on YouTube — no file uploads, no external servers, everything happens in your browser.
WHAT IT DOES
Speed Control — Slow down or speed up any YouTube video from 0.25x to 4x while keeping pitch locked. Perfect for learning music by ear, language study, or accessibility.
Transpose — Shift the key of any song up or down by up to 12 semitones (a full octave). Great for singers who need a song in a different key, or musicians learning in a different tuning.
Pitch Fine-Tune — Adjust pitch in 1-cent increments (±100 cents = ±1 semitone) for precise tuning. Useful for matching instruments that are slightly out of standard pitch (e.g. A=432Hz recordings).
Vocal Removal — Reduce centre-panned vocals using mid-side DSP processing. Works instantly with no download. Best on stereo pop recordings with vocals mixed to the centre.
Test Tone & Analyzer — Built-in A4=440Hz reference tone generator with real-time frequency detection, RMS level meter, and harmonic analysis. Use it to scientifically verify that pitch shifting is accurate and timbre-preserving.
Speed Accuracy Test — 5-second precision playback rate measurement to verify actual vs expected speed.
Harmonic Snapshot Comparison — Take before/after spectral snapshots to confirm that changing pitch or speed doesn't affect the tonal character (timbre) of the audio.
WHY FIREFOX
Every competing extension of this quality is Chrome-only. MusicTools is built specifically for Firefox using the WebExtensions sidebar API, AudioWorklet, and the Rubberband WASM library — bringing professional audio tools to Firefox users for the first time.
PRIVACY
MusicTools processes all audio locally in your browser. No audio, usage data, or personal information is ever sent anywhere. The extension requires only the minimum permissions needed to function on YouTube.
KEYBOARD SHORTCUT
Alt+M — Toggle the MusicTools panel open/closed from any YouTube page.
WHAT IT DOES
Speed Control — Slow down or speed up any YouTube video from 0.25x to 4x while keeping pitch locked. Perfect for learning music by ear, language study, or accessibility.
Transpose — Shift the key of any song up or down by up to 12 semitones (a full octave). Great for singers who need a song in a different key, or musicians learning in a different tuning.
Pitch Fine-Tune — Adjust pitch in 1-cent increments (±100 cents = ±1 semitone) for precise tuning. Useful for matching instruments that are slightly out of standard pitch (e.g. A=432Hz recordings).
Vocal Removal — Reduce centre-panned vocals using mid-side DSP processing. Works instantly with no download. Best on stereo pop recordings with vocals mixed to the centre.
Test Tone & Analyzer — Built-in A4=440Hz reference tone generator with real-time frequency detection, RMS level meter, and harmonic analysis. Use it to scientifically verify that pitch shifting is accurate and timbre-preserving.
Speed Accuracy Test — 5-second precision playback rate measurement to verify actual vs expected speed.
Harmonic Snapshot Comparison — Take before/after spectral snapshots to confirm that changing pitch or speed doesn't affect the tonal character (timbre) of the audio.
WHY FIREFOX
Every competing extension of this quality is Chrome-only. MusicTools is built specifically for Firefox using the WebExtensions sidebar API, AudioWorklet, and the Rubberband WASM library — bringing professional audio tools to Firefox users for the first time.
PRIVACY
MusicTools processes all audio locally in your browser. No audio, usage data, or personal information is ever sent anywhere. The extension requires only the minimum permissions needed to function on YouTube.
KEYBOARD SHORTCUT
Alt+M — Toggle the MusicTools panel open/closed from any YouTube page.
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Permissions and data
Permisos requeridos:
- Acceder a las pestañas del navegador
- Acceder a tus datos en los sitios del youtube.com dominio
Data collection:
- The developer says this extension doesn't require data collection.
Más información
- Versión
- 1.0.35
- Tamaño
- 255,22 KB
- Última actualización
- hace 6 días (10 de abr. de 2026)
- Categorías relacionadas
- Licencia
- Todos los derechos reservados
- Historial de versiones
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