I tried to make the subject be as explicit as possible to help if people didn't want to read this. I just upgraded to Sierra and have noticed that the "in" and "out" of content sound effects have been switched for interaction. The performance is consistent, and VO does what I want it to do, but my brain got used to the sound effects and the level of cognitive distortion is real for now. So, is this a bug or feature, or something specific to my system? If I can confirm it's a bug and not just me, I'll of course report it.