This app DOES do what it says it does. It DOES allow one to use a sonos attached iPhone as a Mic into the sonus system . Easy. Works like a champ . BUT !!! There is a 1/2 second delay between mic and sound . And an uncontrollable extreme amount of feedback. Im an engineer and I understand why, but cant be used as a PA. Worth the small $ paid, so Im not upset. If the mic was not in the sound field of the speakers , this would work . But if it is, then will fail. Do NOT expect this to provide a wireless mic thru sonos. I punted and bought a $100 wireless mic from a music store and an feeding it through the aux in of the Play5. Works great.