Linking Zones
You can link zones 1 and 2 to keep the volume levels synchronized. Adjusting the volume of either of the linked zones affects both zones.
Select
> 
> Fusion Link > 
> Music > Zone 2 > Link to zone 1.
> > Fusion Link > > Music > Zone 2 > Link to zone 1.
NOTE:
After zones 1 and 2 are linked, you cannot adjust the volume of each zone individually.