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In addition to transmitting audio from traditional applications, Airfoil can transmit from certain special sources, as well as hidden background processes which do not appear on your Mac like traditional applications. This includes system services, as well as the occasional command-line tool.
Airfoil's Source selector makes it easy to choose several popular sources which would otherwise be very difficult to find. This is done through the Special Sources section of the menu, where you can choose Finder, Siri, Text to Speech, or VoiceOver.
Choosing the Finder special source will allow the capture of any audio played by Finder.app, as well as by the hidden
QuickLookUIService process (or the hidden
quicklookd process on MacOS 10.13 and lower), which plays audio when using the Mac's “Quick Look” functionality.
The Siri special source makes it possible to capture all the audio from the Siri experience, including its sound effects. When capturing this source, audio is merged from the system's
com.apple.speech.speechsynthesisd process which provides Siri's spoken word audio and the
assistantd hidden process which provides its sound effects.
The Text to Speech special source captures audio played by the system's
com.apple.speech.speechsynthesisd process. This powerful process provides audio for several parts of MacOS, including the spoken dialog from Siri, the system's text reading (triggered by the Start Speaking command in the Speech menu, and the accessibility hints spoken by VoiceOver.
While you may see other sources with these names in the Running Processes menu, choosing them is not likely to provide the desired audio. Instead, choosing Text to Speech will enable you to capture this audio.
Note that the Text to Speech source does not include the sound effects created by Siri or VoiceOver. If you wish to include sound effects, you should use instead choose the Siri or VoiceOver special source specifically.
The VoiceOver special source makes it possible to capture all the audio from the VoiceOver experience, including its sound effects. When capturing this source, audio is merged from the system's
com.apple.speech.speechsynthesisd process which provides VoiceOver's spoken accessibility hints and the
VoiceOver process which provides its sound effects.
By default, other hidden sources are not shown in Airfoil's Source selector. However, if you hold down the Option key when clicking on the selector, a new Running Processes sub-menu will be shown. Within the Running Processes sub-menu, you'll see a list of processes from which Airfoil may be able to capture audio. While the Running Sources menu will show dozens of different processes, only a few of these are likely to produce audio.
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