OK joust,
hit the midi button,press 1. choose master, then hit the pad number one in the first bank A with no light on the bank 2 button, hit the lower left hand pad, and change it's number to 35, then hit the next one to the right, change it to 36, then keep moving left to right, bottom to top, when you get to pad 16, change bankc and start from the lower left again, but one number higher than the number you used on pad 16 in the previous bank, so if the pad 16 on bank 1 is 50, the first pad on bank 2 is 51. When you finish with bank D, then go back to the menu and choose program, and set it up the same way. it will make using the 950 much easier.
Your old Programs will load with their old midi assignments, this will work on all new programs. if you are using the mpc editor, then you need to save a blank program (right after you boot the machine, after you;ve done all the midi assignments) and put it on disk, then put it into the computer and open it in the MPC editor and load your samples into it from there, that will keep the assignments.