It would make it much more visible if the whole track got “greyd” when it is turned off.
Right now they all look the same except for a tiny tiny icon.
On a second thought greyd out is not good, as it means that one is not able to edit them, instead some other kind of more visible option would be better…Perhaps a transparent OFF behind the track?
Maybe just solve this like in MilkyTracker? Have a preference for how much a muted track is darkened. AND you can still edit it 
Flip it horizontally! 