Blackmagicdesign ATEM Installation And Operation Manual page 214

The MUTE button
In the ATEM audio mixer interface, audio is always on, or present in the mix, when the ON
button is selected. When the ON button is deselected, audio is not present or is muted.
To match the software interface, you'll find the MUTE button on your audio mixer control surface
will be lit when audio is always on or present in the mix. The MUTE button will be unlit when
audio is not present or is muted.
Decibel Scales
All hardware mixers are made differently, and the scale printed on your control surface may not
match the scale in the ATEM audio mixer interface. Always refer to the ATEM audio mixer levels
for the true decibel scales.
Using Audio 214