One you got your levels ready with the faders, instruments panned to their locations, filters applied, dynamic processors inserted, and tone shaped with the EQ… you can move onto the next step of adding reverb and delays.
Both reverb and delays are time-based processors that create echo-like effects of the signal. By creating and delaying the reflections of a sound, you can make it appear further back.
Think about it like this: imagine a person speaking to you up close versus very far away. They sound different because of how long it take for the initial sound the reach the ears as well as the following reflections from the space around it. Reverb and delays create artificial reflections to trick the mind that a sound source is father away than what it seems.
The purpose of using these time-based processors is to give some distance between the instruments. Just like panning was done to spread apart the different sounds, so can reverb and delay.
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