No specific info about version 4.0. Please visit the main page of Airfoil Speakers on Mac Informer.
Allows controlling a BassJump to improve the quality of the sound.
Stream any audio you want to your Sonos speakers' compatible devices.
Desktop application to control Denon Heos network speakers.
Airfoil Source Selector is a makes it easier to connect Airfoil to applications.
This application is designed for MUN conferences to organize speakers.