I do this at the moment via MakeMusic Finale: there I can set the playing of notations from "even" to "swing", and then export it as MIDI and import it back into Band in a Box, where then the eighth notes are correctly recognized as triplets. But this is of course quite a detour. Also it does not work the other way round.
It would be great if Band in a Box would offer this feature internally (I just posted this in the wishlist forum).


Biab/RB latest build, German Language Pak, Win 10/64 Pro, 1 TB SSD, 32 GB RAM. Notation SW Finale, StaffPad, SmartsScore – Playing Double Bass, Guitar, Piano