DOD REX drum loops can be imported and used in Stylus RMX via the Sage Converter. This is a utility that is made by and comes with Stylus RMX. It should be located in the applications folder after installation of Stylus. This is one of the many videos provided by Stylus and talks specifically about importing third-party REX drum loop libraries using the Sage converter. You never know how completely up to date manufacturer videos are, but this should getting you going if you are new to Drums On Demand REX loops as well as Stylus RMX.