What is a REASON file? A REASON file is a song project created by Reason, a digital audio workstation ( DAW ) developed by Reason Studios. It stores a complete music production project, including MIDI data, audio tracks, virtual instrument settings, effects, mixer routing, tempo information, and arrangement details. REASON files do not contain a single exported audio track, but instead save all the components required to edit and reproduce the song within the software.

More Information The REASON format is the primary project format in modern versions of Reason. Music producers, composers, sound designers, and recording engineers use REASON files to store songs, film scores, beats, and other audio productions they create, as well as the edits they apply to them. Since the format preserves the full production environment, it allows users to continue editing a project at any stage.