Maestro has an option, bottom left corner, a box marked "triplets / swing rhythm", have you tried using that?
Yes, when making .abc's I take advantage of that feature, but that is not the issue.
My .abc's played perfectly fine a while back in-game. Now the same .abc's aren't timing right. I have to stress that the .abc files that worked before did not change, they simply aren't playing right anymore.
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