Teamviewer is lowering my Macbook Pro's audio Last week I found out when I am in a Team Viewer meeting, Team Viewer is lowering my Macbook Pro's audio. It sets the audio around 10%. When I put it back at 100% it's not the full 100% (for example, it's hardly to hear my friends on Team Speak). When I quit Team Viewer my audio is back at normal. 

Does anyone know what the problem is? 

Edit

I created a video which will explain the problem:
https://www.youtube.com/watch?v=JaiYha6XNno
This sounds like the audio ducking feature, commonly used by video chatting applications to temporarily lower the volume of other sounds.

To turn it off, go to Applications/Utilities/VoiceOver Utility.app > Sound

Uncheck "Enable audio ducking".