RAW file playback is a feature of playing the original file without compression.
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To play the original file without compression, open the file and on the track control panel, click on the "RAW" button.
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This button becomes active if a large audio file has been compressed on the server to reduce network load. With the exception of AIF files, these files, in their original quality, cannot be displayed by the browser, so they will always be played in compressed form.

The RAW file playback feature is available in the Pro plan.
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​What's next:
​How to easily listen to your audio using the Pibox Mini Player