Most DAWs can do this. Actually this is what Recycle is meant to do. U chop on the downbeats and play at whatever tempo suits you. Reason 6 will have time stretching to make this even easier. Sonar, Acid (which was the first daw to do what you are doing in Garageband btw), Fruity Loops, and I think Cubase even has features that do this. Its not Garage band exclusive.This is why I love using Garageband/Logic Express/Studio...with the flex time feature, I don't need to change the tempo of the drums to match the sample...I can manipulate the sample to match the tempo of the drums!
If you have a mac with Garageband, I suggest trying it out and export the samples back to recycle/reason...
chop on the drum beats
i didnt say chop on every drum beat. u gotta think before u take things too literally and see what fits and what doesn't nothing is ever right 100% of the timeMeh I don't agree with that unless you're specifically looking for a choppy sound, most times those notes carry over the sound of the drums.
Or maybe I'm just wrong...what I do especially with Reason is just keep moving it little by little until it's on.