A momentary loop that repeats a short slice of a track for a stutter effect, then returns to where the track would be.
A loop roll, or beat roll, temporarily loops a small slice of audio while the track keeps running underneath, so when you release it you jump back to real time. It creates a stutter or build effect.
Why it matters
Loop rolls are a fast way to add tension or extend a moment in a transition without losing your place in the track.

