XA Series User's manual - Page 17
6.6 Output
Source
IN1-2:
This sets the input channel source for the current output channel. It can be
used to mix the input source (in dB) or disable it (Off). If more than one
input sources are enabled, they will be added together as the source for the
current output channel.
O1:______ Source
IN1:Off
O1:______ Source
IN2:-14.00