JJazzLab embeds the YamJJazz rhythm generation engine. This engine reads Yamaha style files and introduces a new Yamaha extended style file format which adds more variations to existing Yamaha style files.
You can see below the 2 YamJJazz rhythm providers available in the rhythm selection dialog.
The YamJJazz standard styles rhythm provider reads standard Yamaha files such as .sty, .prs, .sst or .bcs.
The YamJJazz standard styles rhythm provider reads “YamJJazz Extended” Yamaha files with the .yjz extension (the corresponding standard Yamaha file must be present too).