Yamaha 02R Owner's Manual page 261

Groups and Pairs 151
Auxiliary Pair Display Screen
Shown below is the second PAIR display function - the Aux Pair screen.
You can pair the auxiliary send channels – AUX 1 through AUX 6:
Use the CURSOR buttons to select a channel pair and press the [ENTER]
button to pair or separate them.
Digital Recording Console 02R User's Guide