About ReFills A ReFill is a kind of component package for Reason, which can contain sounds and effects patches, samples, REX files, SoundFonts and demo songs. If you like, you can compare ReFills to ROM cards for a hardware synthesizer. On your computer, ReFills appear as large files with the extension “.rfl”. All sounds included with Reason 9 are embedded in three ReFills named “Reason 9 Sounds”, “Orkester Sounds” and “Factory Sounds”, which were (downloaded and) copied to the hard disk during installation. Additional Propellerhead ReFills are available for purchase. You can also download ReFills from other Reason users on the Internet, purchase them from other sample manufacturers, etc. • Samples (Wave and AIFF files) are compressed to about half their original file size when stored in ReFills, without loss of quality. In Reason, you can use the browser to list and access the embedded sounds and other components within the ReFills, just as if the ReFills were folders on your hard disk. Furthermore, if a song makes use of components from ReFills, Reason will tell you which ReFills are required.