Airfoil allows you to send any audio to AirPort Express units, Apple TVs, and even other Macs and PCs, all in sync! It's your audio - everywhere. With Airfoil you can take audio from any application and send to your AirPort Express units, as well as Apple TVs, and even other Macs and PCs running Airfoil Speakers! Transmit audio from RealPlayer, Windows Media Player, QuickTime Player, and other media players. Send audio from web-based applications like Pandora, Last.fm, and other to the AirPort Express. You can even stream audio from audio devices like RadioSHARK, XM and Sirius radios, around your house.
Requirements
Intel, Mac OS X 10.6 or later.
Version 4.0.1:
Instant On 3.0.1 fixes corrupt audio from Spotify, System Audio, and others, as well as curing memory leaks which could occur.
The Install Extras window has been improved for easier use.
Several memory leaks have been fixed.
Playback of some QuickTime files has been improved in Airfoil Video Player.
Playback in Airfoil Video Player is now synchronized with monitor refresh, to eliminate tearing.
Airfoil Video Player now supports .dvdmedia packages, as well as other containers for VIDEO_TS folders.
Airfoil Speaker's main window is now always shown on the first launch of version 4.x.
Audio input devices with low sample rates now work correctly with Airfoil.
SSME license keys now correctly prompt for an upgrade.
The Source popup now shows a keyboard focus ring when appropriate.
Airfoil no longer incorrectly accepts folders when dropped onto the main window.
If Instant On is not installed, a useful error message is now shown when switching to System Audio during active transmission.
Dragging local movies into Web mode now correctly switches to Local File mode for improved playback.
A rare Airfoil Speakers crash has been fixed.
Airfoil Speakers now properly prevents the computer from sleeping while it's receiving audio.
Audio playback in Airfoil Speakers after switching audio output devices has been improved.