Audio-Technica ATDM-0604a 6-Channel Digital SmartMixer - Manual (Page 51)

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Key functions
Setting AEC
1. Click “AEC”.
2. From “Mode”, select “AEC”.
3. From “AEC Reference”, select the reference signal (the signal for
removing echoes).
• In general, a signal from the other party is set as the reference signal.
4. Turn AEC ON for the microphone to be used (for each channel).
5. Select the BUS to be processed from "Input bus".