Yamaha O2R Owner's Manual page 81

72 Mixing and Automix
02R Getting Started Guide
CANCEL is the default. To cancel the NEW operation, either press the
[ENTER] button or wait about 10 seconds—the NEW operation will be
automatically cancelled.
To create the new automix, use the CURSOR buttons to select the
"EXECUTE" icon and press the [ENTER] button. The last scene memory
that was stored or recalled will be inserted at timecode location 00:00:00.00.