Perfect add on for karaoke. A must have!

Love it! Now I can finally sing karaoke in lower keys!

This addon is pretty much as good as it gets when it comes to Speed/Pitch Changers, on ANY browser. This addon absolutely TRASHES on the largest one on Chrome (transpose.video), with the latter having to thank it after. Obviously nothing even remotely compares on Firefox or anything else. Excellent work easily one of the best addons a web browser can have, and a genuine W for Firefox.


I strongly agree with the other review on this being very worth porting to Chrome though.

I'd really love if the creator could make a version of this extension for Chrome.

worked better than i would have thought, very good

This was exactly what I was looking for, and has served me well for over a year. I can change the speed and pitch independently and easily.

A great Firefox alternative to the Chrome-only https://transpose.video, which does what it says on the box.

The pitch-shifting algorithm does produce slight artifacting at certain pitches, but overall works well enough to be able to sing along.

*However, keep in mind that for it to work well, the (preserved pitch) option has to be turned off.

The key change distorts the audio into an insane mess. The very well hidden "Pitch presevation" does nothing to fix this. The speed shift seems to work on that (lots of artifacts though), pitch preservation works on that.

It's doing really interesting things, just not what I'm looking for in a pitch shift extension. Think it needs a rework. Or... reskin and call it The Sataniser? :P

Love it! Best add-on to be able to 'Nightcore' your music wherever you listen to it.

Small issue, though: Doesn't currently seem to work in Spotify, though. It will change the song for a few seconds before it goes back to normal.

yes i actually like this speed pitch changer update it works better it does and i did not like the other one i did not you know the old update i did not just the new one i do but one thing though i knowest somebody's gotta fix the high pitched voice because it sounds like when you go upper it sounds like the voice goes back to the original it does at the end when you tune the pitch upper the low pitch sounds fine but the high pitched does not and i knowest once in great while too it keeps loading too sometimes like the youtube videos does and do you guys think you can change the quality to high quality too or no because sometimes it sounds like a robot quality it does can you guys change it to the original quality or no you know the high quality or no and yes i think there should be cents too there should be -update you know like semitone cents like -99 to +99 cents there should be so we can change the cents and the semitones both we should have next time whenever the new update comes out and hey hyperk i think that's a great idea somebody should defintely call it the satanizer they should whenever the new update comes out and yes your right it does need a rework it does because the high pitch keeps going back to the original pitch at the end with high pitch it does hyperk you know when tuning upper it does and yes your right the quality does need be fixed it does and that's what i was saying too it needs high quality better quality it needs defintely too and i think they should get rid of the infinity semitones and put only 206 semitones they should and that would be a lot better it would because infinity takes long ways to get up there it does and it defintely needs cents too it does with it like -99 cents to +99 cents it needs and maybe cents should be in the bottom and semitones on top of cents and remember it has to be that goes up to 99 cents it does too it does and makesure the new update ends up like that with cents and semitones please and thank you and everybody should defintely call it the satanizer they should whoever makes the new update should defintely call it that please and thank you and yes please make do the rework instead of reskin okay please and thank you and the new version should be called 1.4.3. it should be called too defintely please and thank you and remember don't forget about all of this stuff okay whoever makes the new update please and thank you

Works great! Top buttons change speed & pitch, bottom buttons change pitch by semitones (independent of speed). Well done!

Such a simple, incredible tool. The musical accuracy is very useful and so is the proportionality and lack of quality loss. Having great experience with it by giving new life to songs by the click of a button.

Fantastic addon for desktop version of Firefox.

Suggestions/ideas for the future:

[01] A 'Preserve Speed' slidebar option. Self-explanatory: pitch can be changed without affecting playspeed.

[02] Dedicated behavior modifier functions (additive, multiplicative) for play speed and pitch, separately.

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As of this posting date, this addon exhibits the following issue in Firefox Beta (Android):

[01] Within the menu interface, switching the On/Off slider to 'ON' position reverts back to 'OFF' position upon exiting, as well as forcing the active page to reload.

You can no longer change the settings or use commands

Does as good of a job with speed change as premium software. Thanks guy