Rhythms are made available by rhythm engines. Some rhythms can be based on rhythm files.
For example the YamJJazz rhythm engine provides rhythms built from Yamaha style files such as poprock.sty or TripHop.S510.prs.
JJazzLab expects rhythm files to be in the User directory for rhythm Files. The location of this directory can be changed in the Options/Rhythms.
Your rhythm files are scanned at startup only upon a fresh install, and the rhythm list is saved into a cache file.
This cache file is then used to get the rhythm list upon next startups, which is much faster than the initial scanning -especially if you have many rhythm files.
In order to avoid having too many files cluttering the User directory for rhythm files, the recommended way is:
Test the rhythm files In the rhythm selection dialog, use the Add Rhythms button to load additional rhythm files for the current session only. These files can be anywhere on your hard drive.
Copy the validated rhythm files Once you have selected the “best” rhythm files, copy them somewhere in the User Directory for Rhythm Files (see above).
Force a Rescan from Options/Rhythms