Yamaha MCX-CA15 Owner's Manual page 216

Broadcast
3
Press SELECT. When the Client screen appears on the display, use
u/d to select "Broadcast".
4
Press SELECT. When the Client Broadcast screen appears on the
display, use u/d to select a MusicCAST client.
5
Press SELECT to check/uncheck the checkbox.
The MusicCAST server targets MusicCAST clients with checked selection boxes
for Broadcast.
Repeat this step to change settings for other MusicCAST clients.
6
Useu/j/d/i to select "OK" and press SELECT.
The MusicCAST server saves the Client Broadcast settings.
10 MusicCAST Version Upgrade 1
Cancelling the setting
operation
Press BACK, or move the cursor
to "Cancel" and press SELECT, to
return to the Client screen.