I think it would be extremely useful to either add an option within the audio section to apply a fade in / out of the audio tracks (just a standard ramp no need for complex settings), or to just apply a fade in / out of the same duration when applying one to the video track. Although I appreciate it may not be a simple task :(

I've been testing and I'm fairly certain I can't hear one having been applied. I do think people would naturally think that if they have applied a fade out of the picture, then the audio will be faded as well....

Owen.