I'm not affiliated with the seller.

As far as I know, no new style parameters were introduced on the BK- series. They can read and play styles from any previous Roland arranger.

The BK-7m can play user styles from a USB thumb stick. However there are no on-board facilities to create or edit styles, as there are in the BK-5, BK-9, or some older Roland arrangers.

I'm not sure whether Roland supplied a software with the BK-7m to edit styles. Maybe the seller can tell us that. -Ted