Yamaha M7CL Owner's Manual page 66

Sending the signal from an input channel to the STEREO/MONO buses
Operating the TO ST BALANCE knob of a ST IN
channel will change the level of the signals sent from
the ST IN L/R channels to the STEREO (L/R) bus and
MONO (C) bus as shown in the following diagram.
L C
TO ST BALANCE knob
L C
TO ST BALANCE knob
66
M7CL Owner's Manual
Signal sent from the
ST IN (L) channel to
the MONO (C) bus
Signal sent from the
ST IN (L) channel to
the STEREO (L) bus
R
Signal sent from the
ST IN (R) channel to
the MONO (C) bus
Signal sent from the
ST IN (R) channel to
the STEREO (R) bus
R