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Airfoil and Airfoil Satellite are two distinct applications. Airfoil streams audio out from your Mac, while Airfoil Satellite acts as a receiver and remote control on other computers. To stream audio from your Mac out to devices across your network, be sure to use Airfoil. Read on for more details.
When Airfoil is running on your Mac, it can act as a transmitter. You can use Airfoil to stream to any compatible receivers, so the desired audio is heard through them.
Devices running Airfoil Satellite act as software receivers, receiving audio from Airfoil, as well as AirPlay senders like iOS and Apple Music. Airfoil Satellite can also serve as a remote control, enabling you to adjust Airfoil's speaker selection and volumes, as well as the playback of supported sources.