Pioneer SCSI-2 - Manual (Page 78)

Pause/Resume
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2.10 Pause/Resume (4Bh)
Operation Code is (4Bh)
Resume
A Resume of zero indicates that the drive enter the hold track state with the audio output
muted. A Resume bit of one indicates that the drive release the pause and begin play at the
block following the last block played.
The PAUSE/RESUME command requests that the drive start or stop the current audio play
operation. This command is used with PLAY AUDIO commands, issued while the immediate
bit(Immed) of MODE SELECT PAGE CODE E is set to one.
This command is terminated with Check Condition status if the resume bit is zero and the audio
play operation cannot be paused (i.e. an audio play operation has not been requested, or the
requested audio play operation has been completed).
It will not be considered an error to request a pause when a pause is already in effect or to request
a resume when a play operation is in progress.