Recording program changes

How can i record program changes on the mpc so that as i hit the pads (or external triggers), the the sample assigned to that pad will change? I want to play my digital drums and have the mpc sounds change as i play.

Go to the Program screen and press open window in the PGM: field. Set the MIDI program change number for that program. Then go into Step mode and press INSERT (F3). Turn the dial 'til you get to Program Change, and hit do it. Select the MIDI Program Change number of the desired program, and your done. The program should change during playback of the sequence at the specified piont.

Many Thanks