Good question. I just read the psr740 manual, and there is no mention of enabling loop functionality for multipad patterns.
I would be interested in that answer as well.
The xp60 offers its rps function (similar to multipad) in three flavors, one time play, play until key is unpressed, and loop play, which ends when key is pressed again.
It would only make sense psr offers these too, otherwise I would find multipads limiting.
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