I have observed the following for ambient sounds that are set as being global from the mesh options in Fear:
* a 22,000Hz stereo sound plays at the correct speed
* a 22,000Hz mono sound plays at double speed
* a 44,000Hz mono sound plays at the correct speed
I discovered this after trying to make a 22,000Hz TFL ambient sound tag (am03) work in M2. It may work in TFL, but it's chipmonk land in M2.