See also:

Random playback
To playback a track/index/file(s) at random, press the “RDM” button for 0.5 second or longer (type C audio)/briefly (type D audio) while the track/index/file is playing. Each time you press ...

Non-turbo models
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FM/AM radio operation
Press the “FM” or “AM” button when the radio is off to turn on the radio. ...