Q: What is the actual difference between Delay and Reverb?
A: This gets confusing fast. They are not the same thing at all.
Reverb is thousands of microscopic reflections blurring together to create a smooth "wash" of sound. Think of shouting inside an empty parking garage. Delay is a distinct, repeating echo. Think of shouting into a massive canyon and hearing your exact words bounce back a second later. "Hello... Hello... Hello..."
Q: How do I get that classic rockabilly "slapback" echo?
A: Slapback delay is famously used by Elvis and Johnny Cash. It's incredibly easy to recreate.
Upload your vocal or guitar track. Set the delay time very short—somewhere between 80 to 120 milliseconds. Turn the feedback (the amount of repeats) entirely to zero so you only hear one single immediate echo. Presto. You have instant 1950s rock and roll tone.