sustained notes on mpc2000xl

i want to be able to use a one shot bass sample, use the tuning feature of 16 levels so i can play basslines. the problem is that when i tune it the speed of the sample changes. i know there is a way to set up a sustained loop so that as long as i hold down the pad the note will play until i let go. if anyone has tips it would be greatly appreciated.
 
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