just to follow-up... you should all know that antonym's technique of distinguishing new pads from old ones is probably the quickest way to confirm if your mpc came shipped with the new ones or not. and it's real easy to do too.
as soon as i took it out the box, i went for pad #13 and pulled the upper left corner out of the frame gently with my fingernail...
i could tell right away when the excess rubber popped out, that these were definitely the new pads...
and don't worry... the excess rubber lip can be tucked back under the frame easily and your mpc will be back to normal in seconds...
my model is just the MPC1000BK... it does not have the letter N... i'm still not sure if there are any differences between that model and mine... but these are definitely the new pads.
hope this helps some of you... and thanks for that tip, antonym.