Do your MPC500 or MPK pads just not feel sensitive enough?
Here is the solution from MPCstuff.com
Our MPCstuff.com Pad Corx Sensitivity Upgrade Kit comes with a complete set of 12 Pad Corx for your Akai MPC500 or MPK 25 or 42. These Pad Corx have adhesive bottoms to make install a breeze. They are also easily removable if you don't wish to use them anymore with no mess.
These Pad Corx will fit all Akai MPC 500 , Akai MPK 25 and Akai MPK 49.
Our Pad Corx use the original design of the MPC pads by utilizing the rectangular pad triggers. Don't settle for pieces of electrical tape or rubber that are hard to install.
NOTE: ACTUAL PADS ARE NOT INCLUDED, ONLY PICTURED FOR REFERENCE.