Reverb pre-delay

Pre-delay can make the reverb sound far away and the dry source close. This can get depth on a vocal.¹ You can calculate pre-delay according to BPM with an equation or with this website.

Marc Daniel Nelson uses 70, 120, and 200ms. He also automates pre-delays to heighten the scene.¹

By sending instrument groups to different pre-delays and returning to one room reverb, you can create a soundstage. Warren Huart uses longer pre-delays for farther away sounds, as if they were arriving to a room mic at different times.²