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If it's something that can easily be added, I think it would be cool to have a little feature somewhere in the menu that would make the tracker play the notes back in backwards order.
Well it's not hard, it's just that I have plenty of other things to work on.
I can't tell exactly all steps needed to have it working, but you can start looking in FamiTrackerView.cpp. The function PlayerCommand receives info on when to step down. Then you also have to make it start from the bottom of patterns and stuff like that.