it's on page 20 in the jjos manual, at least in the pdf version of the manual that i once downloaded. manual is also online available as a webpage. the chapter is called "pad to midi note out"
you have to save a program to have your mpc recall that setting!
Change it manually, set up all your notes the way you want. Save that as a program. Place it in the ROOT or an AUTOLOAD folder, whichever your manual says to do. It will load up when powering on your machine.