You must select the following App as the source in Airfoil:
- Code: Select all
/Library/Application Support/Perceptive Automation/Indigo 6/IndigoServer.app
My guess is you're selecting the client (Applications/Indigo 6) which won't work because the server is generating the speech.
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UPDATE] In newer OS releases, you must select com.apple.speech.speechsysthesisd as the source for any text that the Indigo Server speaking to be directed by Airfoil. Apple changed the way speech is rendered so that it's all actually spoken by the above process rather than the actual app requesting it.