reproduce
- record something into the looper, a bar in length
- halve the length ten timesso that whatever you played now it sounds like a buzz
- double the length back up ten times so it is once again a bar in length
- turn the feedback down to make the horrible buzzing sound go away.
- play something into the looper
- bzzzzzzzzz sound on whatever you play
or perhaps something even weirder . because once the length is back up to a reasonable bar and you play a note in - what is played back does come around on the bar, but it sounds like a stuck flanger.