Tinderbox 4: progress bar2
In Tinderbox 4, you can set the pattern of a note to be bar(50). That gives you a note that's 50% Color and 50% Color2. This can make a handy indicator, perhaps to reflect the status of a project. (Another pattern, vbar(50), makes the bar advance from the bottom toward the top of the note)
The pattern can refer to one of the note's attributes:
Indeed, the pattern can refer to an entire expression:
The Tinderbox site has a page about new features in the Tinderbox 4 map view.