If I'm correct, Soundworx is a German based Mac DSP program. Damn good program. It will do some great things. If you have the pro version, it does all manner of sound mangling, editing and morphing. After you do that you must get the sound into the MPC.
If you have a 3000, you can save your sounds as AIFF files and transfer them to the freeware program, "MPC3000 Convert." It will prepare them as SND files for the MPC 3000. If you have a 2000 or 3000 you can use the shareware prgram, "MPCProgamMaker" and save the files as well as MPC prgrams to the sampler.
Check out:
http://homepage.mac.com/seishu/s's_works/
Good luck.
Homershines