QNAP Security VioStor CMS (Version: 1.0.1) - Manual (Page 144)

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To playback each channel independently using the multi-view mode, click the synchronize
button to cancel synchronization first.
In asynchronous playback, the timeline can be adjusted to playback at different time for
each channel respectively.
Note: While switching to the asynchronous mode, you can independently playback each
channel, but only within the same time interval.