Some suggestions.
The Automatic record-arm icons (red A) are not differentiated between selected and unselected tracks:
Differently highlighted icons IMHO are a much better visual clue of which tracks are actually armed:
See R7 default theme for example:
Black notes\staves on gray background are not easy to read:
Using a white background (as actual sheets) looks much better IMHO.
See R7 default theme for example: