Sonos Multi-Room Music System - Manual (Page 166)

Sonos Multi-Room Music System User Guide 7-6
Volume control
Volume Control
Increases (+) or decreases (-) the volume in any zone, or across a zone group.
The volume panel appears over the current
screen. Volume can be controlled for a zone
group or for an individual zone. Use the Group
Volume bar to control the volume for the whole
group, adjusting each zone’s volume
proportionately.