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Windows uses a relatively new audio sub-system called WASAPI. WASAPI has two modes, shared and exclusive. In Exclusive mode, Windows provides a single application at a time with exclusive access to an audio device. If another application tries to access an audio device that is already locked in exclusive mode, it will receive an error.
This means that if you are using Airfoil with an application that is playing audio in WASAPI exclusive mode, Airfoil will be unable to play the audio through the local computer speakers.
While we can't circumvent this restriction, there are a couple of workarounds available, depending upon the options you can set in your audio application:
Option 1) Set your audio application to use the DirectSound audio subsystem for playback instead of WASAPI.
Option 2) If the app lets you, set it to use Shared Mode WASAPI, instead of Exclusive Mode.
Option 3) Simply don't select the local (Computer) output with Airfoil when your source application has WASAPI Exclusive mode set. This will of course result in audio only being heard via the remote outputs.
For example, in J. River Media Center, you can turn off WASAPI by doing the following:
Or, you can use Shared Mode WASAPI in J. River Media Center: