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You can create a crossfade (essentially an
audio dissolve) from one audio clip to another.
With the audio track(s) targeted, park the Playhead at the
audio cut and hit Ctrl+Shift+D (or drag from the effect panel):
You need to be sure you have sufficient 'handles'
on both clips to accommodate the crossfade.
Creating an audio crossfade
I know about the audio transitions, I was looking to see if there were any other techniques. When watching a trailer, it seems like audio does not fade in and out between clips, but instead, it somehow blends. Perhaps they do such a good job that I do not even realize they are only using audio transitions.
They might be using a third audio source
'blended in' under the crossfade that helps
smoothly bridge the transition.
Just a guess.