Yamaha MY4-AEC Owner's Manual page 15

4
Speak into the microphones as you would during an actual conference
and adjust the input gain of each channel.
Adjust the DME24N HA Gain while watching the "Mic. In" meters in the AEC component
editor so that the yellow segment lights only occasionally.
NOTE
AEC may not function properly if the gain is set too high.
15
MY4-AEC Owner's Manual