Please don't shout,
If you have a wav or aif sample, and it's recorded at the same tempo of your song, then you can use the NNXT or NN19 or even Redrum (which works great with simply triggering samples) to assign the lyrics as a note like C3 (assuming that the root note is set to C3).
If it wasn't recorded on tempo or if you don't know what tempo it's at, you need to get recycle which can turn loops and "slice" them for use in the Dr Rex player.
It's much easier to do all this is Ableton (or Logic?) and there's none of this stuff about slicing etc, you just drag and drop. The main difference is that programs like Ableton can time-stretch, i.e. actually slow down the sample in it's entirety. As apex put it, the Rex loops only change how much time is between beats.
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