In Band in a box there is a 'CHURCH' style. This outputs, full legato notes(till exact end of measure) until a new chord. Export the Church style BIAB midi file.. I import that into Logic Pro, and send that to Genos track 2, and designate as chord detect channel.. It works fine for me.. I can then expand of expressiveness of song with Genos styles.
Sometimes you might want to alter Band In A Box chords, for Genos to work better with.. If the song is just a G chord on one measure, but there is a harmony, or long melody note, playing a 6th, 13th, etc. you might want to alter band in a box chord to reflect that; so Genos will be more in touch with what you want.
I sometimes create slightly different chord detect tracks, for overdubbing one part into a song. one chord detect track might just be triads, and a 2nd chord detect track, will have diminshed, 13ths, mac 7th, etc) and use it create a more intricate bass part, horn line, for sophisticated sound (I am overdubbing one track of a different style into Logic now).. You end up with something that is impossible for any arranger kbd to do. For piano parts I might through in I-V-I, or fit in four 1/4 note chords, so piano is enriched.. This required some patience and practise. but I find it fun.