isn't a Style a midi file with markers to separate the different sections? can't remember exactly how this works.
i was looking at - i think... - CASMedit, or something like that. CASM referring to this method of concatenating the sections' midi data into a single file.
at the time i looked at various bits of freeware for this (am on Windows, so not sure if there were Mac versions), and most of them did not look much fun, considering that it's actually quite a simple principle.
the complication is that there are loads of different 'style' types, for loads of different machines and manufacturers. we just want the type with 6 sections, Intro, MainA, MainB, FillAB, FillBA, Ending. (compare this with the RM1x, which has 16 sections in its Style format. more useful, have always wished the QYs could have a more conventional 'pattern' mode.)
seem to remember that one program did have a more 'graphic' interface. it had some limitations though, was a bit quirky.
and then the one that looked most promising, functionally, as a freeware, actually looked more like a spreadsheet, so not very inspiring.
would be nice to have something simple and quick, with an easy graphic UI, maybe with a verification process, to let the user really exploit card-loading, and all the user style sections available. ie: make it easier to get a bunch of midi files, from computer, into playable form in QY memory. (the RM1x, for example, can handle *.mid files directly, i think, via the floppy drive.)