[curtisblaine]

I still fail to understand why this is a thing. Two possibilities:

1) the beat is created live by a human performer who can't meaningfully hear the other performer(s) in time. He / she is stuck with playing blindly.

2) the beat is pre-recorded - sampled or electronically generated on a sequencer. Then what's the use case in the first place? The other performer can download it offline and play on it live.

All this is done to get something that mimics a live performance (but isn't, because the band components can't hear each other in real time) to someone listen-only at the end of the chain. What's the advantage in doing so? What's the use case?