It has good functions, but lacks synchronization between the metronome and the YouTube player -
would be perfect.

This is awesome!
I was looking for something like that ever since I gave up on Google Chrome.

I did not face the broken audio problems other users reported. Maybe an improvement was pushed in latest updates. Of course the audio gets a bit weird when speed is changed, but the "added audio weirdness" is compatible with what happens on the built-in YouTube speed change.

Transpose works like a charm.

The loop tool with multiple loops with labels is great!


Suggestions:
* Option for continuous pitch shifting (to adjust songs tuned with A=432Hz to A=440Hz, for example).
* Either an option to pin the "pop up" on screen or to have it embedded under the video. (When I am playing with the extension and wanted to adjust the volume, it disappears and it is mildly annoying not being able to keep it open while I click through the page).
* I don't care for the tuner and chord library. Not sure if many people will use those.
* Metronome without automatic beat detection/sync or at least tap tempo and offset adjustment is not really useful.

速度を1%刻みで変更できたら更に良い。

good features, but echo what other review said. transpose shouldn't have to sound like crap, let it change tempo (a full octave transpose would also change to .5 or 2x speed etc). Also couldn't get the looping feature to work, but maybe that's just me.

works as advertised, but i wish there was a way to adjust tempo and pitch at a synced rate, to avoid the choppy static sound. like the "change speed" setting in audacity or like playing a real record/tape at a different speed.