IEI Integration AFL-W19A_17D_W15A-N270 v3.00 - Manual (Page 110)

AFL-W19A/17D/W15A-N270 Panel PC
Page 99
Step 5: Select Mic Volume in the Record section (Figure B-3).
The digital microphone function is now enabled.
Figure B-3: Enabling the Digital Microphone Function
Step 6: Move the slide bar to adjust the microphone volume (Figure B-4).
Figure B-4: Adjusting the Microphone Volume