ableton drum rack

hi,
i get live, and i was looking forward to play drums with my mpc500 via midi as i used to do with reason.
actually i cant map midi notes to live drum racks, i do:

connect mpc midi out maudio midi in;

track -> params -> midi;

go midi sync with mode pad 7 as i used to do, but whatever i do midi notes i assign to pad arent recognised by live.

by the way live works fine as slave, and i can map live's function via midi on mpc's pads but drum rack doesn't work.

any clue?

tnx very much!