Allen&Heath XONE S2 - Manual (Page 21)

Allen & Heath 21 XONE:S2 User
6 Monitor Mono Switch
Sums the left and right signal levels to produce a mono
mix from both outputs.
7 Balance Control
Use to compensate for poor signal balance between left
and right or as a panning effect. The balance control is
disabled if the outputs are set to mono.
6
7
MASTER SECTION