Developed by Propellerhead, the makers of Reason, REX drum loops are a proprietary audio loop format that can be used in everything from Reason's Record, Logic, Cubase Pro Tools (older) Stylus RMX, Riffworks and more. All of our drum loops are available in REX format. Just choose REX as you select format and delivery (downloadable or shipped on disc.)
The REX format has advantages over Acid WAV and Apple Loop formats, but can be more difficult to preview and edit for novices. For this reason, we do not recommend our REX drum loops for beginners.
Originally the format was called "REX" and could only support mono files, but a number of years ago the format (now officially known as REX2) was upgraded to support stereo file.