The audio data's almost certainly being processed by the application itself and only a tiny bit of information sent back to the company's servers - both due to

The audio data's almost certainly being processed by the application itself and only a tiny bit of information sent back to the company's servers - both due to the privacy issues and the implications of having an internet connection open continuously (battery drain, high data usage bills, etc.) This wouldn't be the first time fear and partial information damaged adoption of a promising technology.