Q: Audio Distorted On Mac Mini Phone Calls?

This also happened on a FaceTime video call to the same number today with me.

Same here, same as with OP. On one end (iPhone speaker) it sounds deep and slowed down, on the other end (Mac Mini Late 2012) it sounds high pitched. I tried using both Face Time and the call hand-off feature, and in both cases the same thing happens.

Note, I tried using an iPad and in both cases it sounds just fine. Its only an issue with my Mac Mini Late 2012 running Yosemite. Mind you, I'm having other troubles too such as Yosemite being irresponsive following a "Sleep" (something that is being discussed in other forums).

I did a clean install of Yosemite, but it did not resolve either issue. Apple should address these problems in a patch. 

Same here with 2010 Mac pro. Chipmunk on one end slow spooky guy on the other lol

I'm having the same problem on a brand new mac mini with an iphone 5. person I call sounds like a chipmunk and I sound like a monster to them. Not good.

I have the exact same problem.  Mac Mini (2012) with Yosemite and an external Logitech C615 WebCam.  Works great in other apps like photo booth, but FaceTime has me sounding like a monster and the other party sounding like a chipmunk.  This appears to be an OS X thing, not the WebCam as I've tried others with the same result. 

Big problem...  Help, Apple!

Interesting...  Turn the input microphone volume all the way down, make a FaceTime call, then slowly turn up.  That fixed the issue for me.  Weird!

Tried turning the volume down.  Still speed distortion on both sides of the call.  Mac mini with Logitech C615 webcam and iPhone 5.

It's certainly not a fix, but I've had some success restarting the core audio daemon.

sudo killall coreaudiod

FaceTime calls still intermittently have the chipmunk / slow-mo audio problem, but I find if I restart the core audio then restart the application I have some success.

Not entirely sure what the issue is - It's only happened since release, the previous GM was fine...

Tried it and still distorted.  Thanks for the tip.

Had same problem, for both calls through iphone 5c and FaceTime, using both iphone headphones/mic and external webcam/mic

Seems fixed with update 10.10.1

Did the upgrade and tried it.  Same issues.  Distorted sound in both directions and a 1 to 2 second delay from the MAC/Logitech to the Iphone 5S.  A totally useless feature until Apple gets this fixed.

I have found a possible solution on a different board - http://www.tonymacx86.com/general-help/144038-facetime-yosemite-audio-phone-call -issues.html

About 1/2 way down, someone found that if you run Audio Midi Setup, Find your unknown USB audio device, and change the setting from 16000 to either 32000 or 48000, the audio starts working fine.  I have made a few test calls and my audio is fixed.  I have a late 2012 Mac Mini with Logitech 9000 WebCam Pro.

Thanks