Oh yeah: manually. If you have a stereo track in Multi Track View, you can use the volume envelopes to draw the fades. As I mentioned, with more than a stereo track, you run into complications -- it's difficult to do it evenly across several tracks. Of course, this is a cool thing if, for example, you want to fade out the main part of the music and leave, say, a snare hit at full volume while the rest of the music fades.
To do that, highlight the tracks you want to fade together, and go to Edit/Mix Down Selected Tracks to Empty Track (Bounce) (or something like that); it'll give you the choice of mono or stereo, and you'll choose stereo. I'm assuming that up to this point you have accomplished all the ordinary mixing moves (panning, muting clams, etc) and the song is at its final point except for fading out.
If there's a track you want to "linger" without being faded, you would not highlight it, Then you could draw the Volume Envelope to fade the stereo track the way you want it. If you're not familiar with the Volume -- or Pan -- Envelopes, look in the manual or at least pull down the tool bar menus, where you can tick the Enable Volume Envelope entry if they are not already activated.
Once you have the fade exactly the way you want it, you can go to Edit/Mixdown/Selected Tracks and you'll end up with the whole catastrophe in a stereo track in Edit View.
If you're using Audition 2.0 or later, these directions won't work, because Adobe changed the workflow quite a bit.
Finally, you can fade in using the same tools -- my band always ends a set with "Green Onions", where the singer introduces the band members. The only recording I had sounded really rough when we came in, so I just faded up into the good part. In context (a CD of our songs in set order) it sounds very natural.
how do i get the thing to edit my stuff the way i want it too with fades? 
ok thanks guys. 
