I didn't see anything in the manual about looping. I would download the manual and do a search through the PDF file.
I brought the PSR S900 to a couple of jobs today. As you know, I'm operating the keyboard without being able to use the data select dial. The shows went very well. I performed for the Northwest Suburban Over 50's Club, and I got a fantastic response. One lady came up to me and asked me how much the keyboard cost. Before I could answer, she made a guess: $16,000. She couldn't believe that the price is 1/10 that.
Those S.A. voices are great. I wish I could afford two Tyros' instead of two PSR S900s.