Stream Music and Movies across Your Home - iConnected: Use AirPlay, iCloud, Apps, and More to Bring Your Apple Devices Together - page 51

Figure 3-6
After selecting a source library in iTunes, use the AirPlay pop-over to select AirPlay
speakers.
When you open the pop-over of AirPlay sources in iTunes, notice the Multiple button at top (see
Figure 3-6). It works like the Multiple button in the iOS Remote app: Click it, then select the speakers
and other AirPlay devices you want to send the audio to. You can set the volume for each AirPlay
device separately with the slider that appears below each selected device.
Click the Single button to send the audio to just one AirPlay device, or simply deselect all but one
device to send the audio to just that one.
Stream Audio from Other Apps
It's all well and good to stream music from iTunes to your AirPlay devices, but what about audio
from other apps on your computer? If you use a Mac running OS X Mountain Lion, you can stream