sorry i'm a bit late, i haven't use my mpc 500 for a while, but as i see a lot of right answers , but none complete (for mpc500 users) it's as simple as this...
1 - press MODE ----> TRIM
2 - in TRIM mode, select the loop or sample you want to use and simply set it to LOOP
3 - press MODE ---> PROGRAM , then scroll to PLAY MODE ... set that to note on
4 - go back to your sequence ... and hold the pad you set your sample to... it should be looping , now , as stated in other posts, ..... hold down the pad, then press shift for a while,.. let go ... and voila, your loop will be looping (if it matches your sequence bpm? )
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