LAIA TP-100 Administrator's Manual page 61

 Possible Reason
Echo cancel function is not enabled.
 Solution
Select "Settings > Audio > Echo Cancel", enable echo cancellation on
microphone or enable echo cancellation on line in.
 Problem 7
After the terminal is on, there is no sound in the local amplification.
 Possible Reason
The audio output does not contain local audio input.
 Solution
Select "Settings > Audio > Audio Output > Show advanced settings", enable
HDMI-1 including Microphone and enable HDMI-1 including Line In, etc.
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