I get what sounds like ducking in the Spotify web player. I know this is a feature in mobile (and possibly desktop by now), but sounds odd to have in the web player. No other programme does this, e.g. foobar2000, games, Discord, browser on Youtube or Netflix. Could also be volume normalisation? The problem seems to occur with certain tracks more than others.
This is on Windows 7 (64-bit) with Firefox 58.0.2 (64-bit).
I spent most of an hour reading threads all the way through 2017, and have made sure of the following:
I'm out of ideas. Anyone have the same problem - or more ideas?