You cant save a whole sequenced beat as a .wav in the MPC because you have created a midi sequence (.seq) using lots of individual .wav files (each drum sample).
You can Record your beat from the MPC into ProTools under on Audio track therefore creating one .wav Audio file of your sequenced beat. Or you could record each track in seperately ie. KICK - Audio 1, SNARE - Audio 2 etc. But only if you have recorded your drum sequence under different tracks on the MPC, Therefore being able to SOLO one track at a time.
Do you understand the difference between a .wav file and .seq? I hope I have cleared this up for you.