What part do you want to control? Do you want Cubase to trigger the MPC 4000's
sequence or do you want to trigger the MCP 4000's samples?
2 Different procedures for those, so you will need to detail what you want.
**
P.S. In regards to saying that he wasted a bunch of money, maybe get some more
background on what he's trying to do. For all you know he's been using the MPC 4000
for 2 years and friend of his showed up with his laptop with a SICK jam in Cubase
and they are wanting to just add some samples or just add some sequences for
their next track.
If not, then he maybe will get to know the Sampler engine and once is familiar with that,
will then tackle the seuqncer function.