No show stoppers but something to add to the list and attend to if time allows.
I have the latest image running on a RPi3
Mute: Repeated Mute/Unmutes often result on the volume wheel going to 0% and so when you unmute the sound does not come back because the volume is now set to 0.
Mute Icon: Might be nice if this is changed for a more conventional icon of a speaker with a line through to make it a little more obvious.
Might be nice to have an Alphabet down the side to allow quick navigation through the lists.
Allow scrolling wrap so that you can go from a to z to a