Hello @Kevin Ying thanks for your post and sorry to hear that you are facing issues with the adjustments of the volume.

According to the last updates on iOS Deezer app, that issue should have resolved. 

But I would agree that you need to be gentle when giving that spin on the crown, otherwise it will jump to a high or low volume quickly.

Make sure you are in the latest Deezer version and your iOS OS on your phone and watch is also updated.

Try to reboot devices or uninstall to see if there is any improvements on the control of the volume.

I really understand what @Kevin Ying is talking about and can reproduce it. Before the latest two updates volume control via Apple Watch for Deezer iPhone stream didn’t work at all. And before that it just worked time delayed. So suddenly you get shocked because maximum volume came to your ears. 
That indeed was fixed by the latest updates and now it works. 
But… you have to use the crown very carefully, because volume reaction is quite sensitive. 
 

It seems to me that volume increases one step each impulse of the crown. Other apps volume doesn’t react in such a sensitive way. I suppose programming it the way that volume increases one step about each three crown impulses would be more comfortable. 
 

Maybe @Leonídia.Deezer you can pass that to the devs as feedback.

Thank you for your responses @Superschlumpf and @Leonídia.Deezer, very grateful to hear updates on this thread.

Yes, I can see that the issue has been somewhat addressed, however, the volume control adjustment on the watch when streaming from the phone is still a little too extreme (one click of the rotation actually results in immediate adjustment in volume.

In comparison, when streaming directly from the watch in offline mode, the volume adjustment sensitivity is essentially perfect. Could a similar sensitivity setting be added to phone streaming as mentioned above?  I suspect there is no issue when streaming directly from the watch because the source is direct, but when streaming from the phone, the watch is the intermediary between the output device and the source, and therefore there is the concern of additional delay.

The solution suggested by @Superschlumpf is great, every three clicks of the crown = single adjustment of volume.

@Kevin Ying 

Totally agree…  

And of course you’re right about the difference between watch offline use and iPhone stream control. Offline volume adjustment directly on watch works like a charm. Exactly same behavior for iPhone control would be welcome. 

Hi @Superschlumpf @Kevin Ying! Thanks a lot for sharing your feedback! I really appreciate it.

I’ll definitely pass your thoughts along to the team.

If you have any more ideas or suggestions, just hit me up!