Cakewalk // Documentation // SONAR X2 // Working with REX files
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Like ACIDized WAVE files, REX files are audio files that are designed to be looped and follow the project’s tempo. The time stretching technology that REX files use is well suited for percussive sounds, such as drums.
Note: REX-based Groove Clips can be edited in the Loop Construction view, but certain Loop Construction view tools only apply to ACIDized Groove Clips. The following Loop Construction view commands, settings and tools do not apply to REX files:
On the File menu, point to Import and click Audio.
The Import Audio dialog box appears.
In the Files of type list, select All Audio or REX (*.rex, *.rx2, *.rcy).
If you want to preview the selected file, click Play. The file will play at the current project tempo.
Click Open.
If you want to disable looping of REX based Groove Clips, use the Track view Clips > Bounce to Clip(s) command or click the track’s Freeze button render the REX based Groove Clip to a standard audio clip.
Unlike ACIDized audio loops, REX files do not store the original pitch (root note) value. If you want a pitched REX file to properly follow your project’s pitch markers, you must manually specify the original root note for each REX clip. By default, SONAR assigns a root note value of G#.
Due to limitations of the REX file format, the root note value can not be saved back to the REX file, and must be manually specified each time you import a REX file into a SONAR project. If you want to permanently save the root note value with a REX loop, export the REX Groove clip as an ACIDized .wav file.

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