How to make a reverse reverb swell

Reverse the sound, add a long reverb, print (bounce) it, then reverse the result back. The reverb tail now rises into the sound instead of fading after it, giving that ghostly swell before a vocal, a hit or a new section.

How to do it

1. Copy the sound (a word, a chord or a hit) to a new track and reverse it.
2. Add a long reverb at 100% wet.
3. Bounce it to audio, then reverse the bounced audio back.
4. Place it so the swell ends exactly where the original starts.
5. Fade in the start and blend it under the original.

Why it works

Normal reverb fades away after a sound. Reversed, it builds up towards it, which makes your ear expect the hit.