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Well the funny part is that in nature echo is more related with reverb, but can be recreated with delay. It's just that echo has a long first reflection. Normally a human ear won't percieve a sounds as "separate" if they follow up faster than 60 ms. If they take longer to follow up we'll percieve them as separate sounds.
So let's take an example. You are in a room. You make a short scream. If the first reflections come back at you faster than 60 ms, you'll have the impression it's still part of your scream, but decaying (so that what the reverb is). If it takes longer, you'll have the impression there is a second short scream coming at you (and depending on the damping specs of the room, maybe even more).
So you see, echo can be recreated with a reverb unit (set slow early reflections) but also with a delay. The basic difference is that echo will sound different than the original sound (as it travelled through the room, so lost some frequencies on the way). The delay (we're talking about a basic one) is just a copy of the original sound.
You see now a delay can be more powerful than an echo. By tweaking the delayed sound you can not only recreate a real echo, but also make stuff that doesn't appear in real nature (like modulating the pitch of the delayed sounds, feedback delaying etc...)
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