I'm trying to share the audio from my Yosemite Host with my Mavericks Guest. I can get Audio Out to work - music will play. But I can't get Audio In to work - I can't be heard on Skype calls. How would I go about debugging this issue? I'm running Parallels Desktop 10 For Mac Version 10.2.1 (29006). I have a Thunderbolt monitor which connects to my server via USB. Host System Preferences are set so that the monitor controls audio in and audio out. Actions -> Configure -> Hardware -> Sound [X] Connected Input: Default Output: Default Actions -> Configure -> Hardware -> USB & Bluetooth Automatic Sharing: [X] Web cameras [X] Bluetooth devices The devices I have listed are: Apple Bluetooth USB Host Controller Apple Display Audio Apple FaceTime HD Camera (Display) Apple Thunderbolt Display None are assigned.