Q-See QSD6204 - Manual (Page 28)

(4) AUDIO PORT SETUP
AUDIO CHANNEL
NUMBER
AUDIO RECORD,
MUTE YES/NO
When you move the cursor to “AUDIO PORT RECORD”
and push the “SELECT” button, the option will be changed
to NO or YES .If the option is YES, the audio will be
recorded onto the hard drive when you push the RECORD
button.
When you move the cursor to “AUDIO PORT VIDEO
CHANNEL” and push “select” button the option will be
changed to “2”. If you push “SELECT” button one more
time the option will be changed to “3” and one more time
will set the channel to “4”.
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