I've tried making and answering two different calls on my 2012 Mac Mini with a Logitech webcam as the microphone source. Both times the audio I hear is high pitched like the Chipmunks characters. The audio the other persons hears is extremely deep like I'm using a voice box. The source device is an iPhone 6. Anyone else have this issue? I used the Logitech for FaceTime video and audio before with no issues.