  
Q. Audio fails
A. Check the audio cable coming into the sound system.
Check if the driver of sound card is correctly installed.
If a sound card is used, set up the level of record input high at audio setting.
Check the setting of DVR program.
DVR program -> Environment set-up –> Audio –> System selection/Input selection/Record channel selection
Note: Real time play- back is possible with video but not with audio.
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