why bother with time stretch? Kanye didn't time stretch for that style. The ASR10 was inaccurate as hell for time stretching. Just saying besides you can hear the gaps in the chops. Honestly the process is as simple as create a loop, set the pitch find the tempo chop it up and create.i dont have ableton open but heres a quick tutorial that may or may not work....
1. set your tempo to what you want
2. put the sample into sampler
3. use the transpose the pitch it up to a sound you like
4. record enable
5. go to the real time view (arrangement?)
6. record the sample on to the track
7. timestretch