Yes. You can create your own multi styles.

Regarding identifying the the Sax soloist, There are five variations of this style with the difference being the number of instruments included with each style. The fifth style features the RealTrack 723 Soprano Sax soloist and is likely the one included in the multi style you chose.

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BIAB 2025:RB 2025, Latest builds: Dell Optiplex 7040 Desktop; Windows-10-64 bit, Intel Core i7-6700 3.4GHz CPU and 16 GB Ram Memory.