Asus ROG Xonar Phoebus Quick Start Manual page 59

6.5.6 ROG Command ENC (Environmental Noise Cancellation)
Function Introduction
ENC is available only when the Control Box is connected to the audio card with
an external microphones.
No Item
1 Environmental Noise
Cancellation
1
Description
Click the check box to enable / disable the Environmental
Noise Cancellation function.
ASUS Xonar Phoebus
59