How to
Enable/Disable Auto Ducking Feature from Input
3 and Input 4?

Auto ducking feature only affects on Input 3(Line-in) and
Input4 (UAC-in), user can enable/disable ducking feature on both input 3 &
input 4 together by a single press on the “duck” button.

User can disable the auto ducking only on either side of
input,  just long press the “duck” button
for 3 Sec. .