Yamaha CS1D Owner's Manual page 444

MATRIX/ST (matrix/stereo) function
When the POST ON button is on
The signal will be sent from immediately after the
MIX [ON] switch or STEREO A/B [ON] switch of
the CS1D.
6 Pairing
This displays the number and short name of the send
source MIX channel/STEREO A/B channel and pair-
ing status.
You can click the heart symbol to set/defeat pairing.
Hint
If the send source MIX channels are paired, the fad-
ers and buttons will be shared as shown in the fol-
lowing diagram.
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