Yamaha CL1 Owner's Manual page 43

If a STEREO/MONO channel is selected
● STEREO channel window
● MONO channel window
❏ CHANNEL SELECT (Channel selection)
Except for the fact that your editing applies to a STEREO/MONO channel, this is the same as the channel selection for
a MIX channel (➥ p.37.)
❏ TO MATRIX
These are the same as the TO MATRIX of a MIX channel (➥ p.37.)
43 CL Editor Owner's Manual