This is such a basic UI issue, I cannot believe a product as "mature" as Spotify has not addressed this.
The volume control does not actuate on mouse down: it only applies when the tracker is dragged/scrubbed in either direction, or when the mouse is released. However, it is very normal for a user to expect to choose a relative position in the volume tracking area to mouse down at, listen to the result, and then scrub accordingly to make a finer adjustment. This is currently impossible, because mousing down anywhere has no audible effect whatsoever.
Again, I am floored that a product that has been in production for 14 years does not even have a fully working volume control yet.
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As a heads-up, it's good to know that the higher the number of votes an Idea gets, the more likely it is for the Idea to be implemented. If you wish to learn more about how your feedback will reach Spotify, feel free to take a look at this article.
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