The `fadeXXX` commands exhibit some inconsistent behavior.
For instance, the `fadeRadio` command can affect the UI sounds (e.g. button click):
```
0 fadeRadio 0; //can't hear button clicks, etc. anymore
```
And `directSay` is not affected by `fadeSpeech` (which is what you'd expect based on the name of the command) and instead is affected by `fadeRadio`:
```
0 fadeSpeech 0;
_somUnit directSay "SentAmmoLow"; //you can still hear the unit
0 fadeRadio 0;
_somUnit directSay "SentAmmoLow"; //now it works
```