Yamaha QL5 Reference Manual page 33

Signal level when LCR mode is selected
If LCR mode is selected, the signal level sent to the STEREO (L/R) bus and MONO (C) bus
will vary according to the settings of the CSR knob and the TO ST PAN knob.
 When the CSR knob is set to 0% (INPUT channel (monaural))
The TO ST PAN knob operates as a conventional PAN knob, and no signal is sent to the
MONO (C) bus.
L C R
TO ST PAN knob
 When the CSR knob is set to 0% (ST IN channel (stereo))
The TO ST BALANCE knob operates as a conventional BALANCE knob, and no signal is
sent to the MONO (C) bus.
L C R
TO ST BALANCE knob
L C R
TO ST BALANCE knob
Signal sent to the STEREO (L) bus
Signal sent to the STEREO (R) bus
Signal sent from the STEREO (L)
channel to the STEREO (L) bus
Signal sent from the STEREO (R)
channel to the STEREO (R) bus
 When the CSR knob is set to 100%
L C
TO ST PAN knob
 When the CSR knob is set to 100% (ST IN channel)
L C
TO ST BALANCE knob
L C
TO ST BALANCE knob
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Signal sent to the MONO (C) bus
Signal sent to the STEREO (L) bus
Signal sent to the STEREO (R) bus
R
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
Input channels
Reference Manual