Back in 2018 Callie of PG Music created a post touting the Stylepicker enhancements in Realband 2018. One of the enhancements allows for the soloing of any instrument within a style. Unfortunately, this feature never existed. It was pointed out in this thread but PG never responded:

https://www.pgmusic.com/forums/ubbthreads.php?ubb=showflat&Number=471836#Post471836