Reduce the minimum iPhone volume (bluetooth speakers)
I was just here searching for a way to do exactly this (reduce the &quot;Step&quot; for volume adjustments).  I gave up and went to solve a couple more music/iPhone related problems.
Anyway, turns out that if you have the Apple Watch and use it's built-in volume control, there are no stops--even when playing through bluetooth it let me adjust all the way from really loud down to whisper.
Another thing to notice--after I adjust my phone volume with the watch I think it somehow affects the built-in controls and I'm able to get a different range but I can't put my finger on exactly what's going on--and after I leave it sit for a while it goes back to it's old behavior.