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4.21 Sound Recording and Playback
4.21.1 Sound Recording
Press [ ] to record sound, at most 30s each time. Save it in system.
4.21.2 Playback
Press [ ] to play the last recording.
4.22 Video Preview
Press [ ] to preview video in the recording channel, press [ ] or [ ] to switch channels,
and press [ ] to exit the preview.
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