We recieved feedback from Peter Gannon, CEO of PG Music. All so called
"MIDI Styles" from the Band-in-a-Box package (see
here) can be used with the Band-in-a-Box plugin for Notation Composer. Other filetypes are specific for the software of Band-in-a-Box. PC Music offers 2300 Band-in-a-Box styles. There are further styles from other sources available, too.
Reinhold