so one could adjust volume if needed while he's tweaking settings in the menus/adding songs to the playlist!
As now if I'm scrolling the library and let's say a song just started and its volume is too high, I have to go back to the frontpage... quite a long route if I need to tweak volume fast.
I'm thinking especially for those people using headphones on hardware volume control boards like the pidac+
(the pidac+ has headphone amplifier and also hw control

If two buttons are too much for small screens, maybe a button that when you hit it shows a big vertical slider.
What do you think?