^ These might help... If they're too fuzzy I can enlarge them a bit yet. If you can't find the tool pallet with the group button on it (pic 2), CTL-G works as well, once you've selected the tracks to tie up. The last slide might seem to suggest that the fade is applied, reversed, at the other end of the file... not so. A separate mark and apply fade is required, but it fades in the opposite direction.
Cross fades are a large piece of cake, Huge in fact.
HTH... I have more.