The age-old question about the dark art of Resampling

[TweakHead]

but of course you can have different samples for different keys on Ableton's sampler. it's just a matter of digging into it, before you start thinking you need something else. these packages that come with most daw software is actually pretty much all anyone's going to need, imo. and it's much more then people used to have access to, like a decade ago, feature wise.

so yeah, best advise here is to learn your tools, see where you can take them. then you'll presumably make much more informed choices on what comes next. but to really answer your question, then Kontakt would be the way to go. alchemy can play samples and do all sorts of things with them, but don't think of it as something to be used for that kind of sampling, more like granular odd stuff then good old school kind of sampling - know what I mean?