I think you have to adjust the velocity once you convert your sample to a program.
You can also add the effects, change the parameters ect.
If you have figured out how to get your sample the full length of the 61 keys please let me know.
I had an xp-60 for 29 days before returning it and getting the Triton. The Triton is FAR better IMHO. The options are great, the sounds are great, it sounds fatter to me (especially the synth sounds), the realtime controls aren't as "clippy"( more smooth), and it doesn't have an annoying grunge/decay defect.
The xp's synth engine is a bit more powerful, but I feel the TRITONS just SOUNDS better, of higher quality. Plus, you can get the MOSS option and have the strongest synth engine out there right now.
The Triton is a complicated piece of equipment. It takes a good while to learn it. It is a little overwhelming at times.
But that is a good thing. It's a powerful machine. And it will always be up to date and rellevant thanks to it's sampler.
Oh, and the realtime control options are great. Much more expansive and useable than the xp.