Boost the audio past 100%
Audio boost raises the volume beyond 100%, up to 400%, after you sign in. Press Ctrl + Alt + U to raise the boost and Ctrl + Alt + Y to lower it.
The audio keys
| Key | What it does |
|---|---|
Ctrl + Alt + U | Boost up by 20% |
Ctrl + Alt + Y | Boost down by 20% |
Ctrl + Alt + N | Normalize on or off |
The same controls are on the widget's Audio tab.
Boost
A quiet recording, such as a lecture recorded from the back of a room, stays quiet at the player's 100%, and boost takes the volume past that limit, between 100% and 400%.
Each press moves it by 20%. At 400% a loud video is very loud, so raise it a little at a time.
Normalize
Normalize reduces the dynamic range: the gap between the loudest and the quietest parts gets smaller. Turn it on with Ctrl + Alt + N for a video where the speaker whispers and the intro music does not.
Volume memory
The extension remembers the volume and the mute state per site. Set YouTube quiet and a course site loud, and each one comes back the way you left it. The Remember Volume card is in Settings, on the Video Features tab.
More audio controls
It does a lot more with the sound than make it louder: bass boost, noise reduction, vocal isolation and five more are each one button under Advanced Audio on the widget's Audio tab. The tab asks for a sign-in, so you reach them after signing in.
| Button | What it does |
|---|---|
| Bass | Bass boost |
| Denoise | Noise reduction, which filters background noise |
| Spatial | Spatial audio |
| Vocals | Vocal isolation |
| Compress | The audio compressor |
| Karaoke | Karaoke mode |
| Pitch | The pitch preset |
| EQ | Equalizer presets |
Audio download
Audio download saves the audio of a video as WebM or WAV. It does not save MP3. Its switch is Audio Download, in Settings on the Download & Capture tab, and the audio is processed on your device.
Related keys
The three audio keys are part of the full table in Default shortcuts, and each can be moved in Change a shortcut.
The picture is next: Video filters.