So its nice to have the tracks turn green letting you know that you already played that track tonight.

And sometimes its nice if you leave the tracks green for another set, you know that the track is something that you have played someplace else.

but it cant do both functions

I thanks that warrants a new color. Tracks turn 'blue' (for example) if they have been played a selectable number of times in the last selectable number of days.

That way you would easily see the hot shit that you always play no matter how large your crates are.