Timestretching individual slices of a sample in software

Love my OT, I found it very useful to be able to slice a sample and then pitch the individual slices using timestretching rather than the regular re-pitch methods found in most hardware/software. Does any actual software out there allow you to do this? I was thinking kontakt, but it looks like kontakt’s slice mode is different than its timestretch mode… are they mutually exclusive? It should be midi playable with a keyboard as well, chopping bits of audio in ableton and timestretching them is not what I’m looking for. Any ideas??