hooking up reason 4 to my mpc 2000 with m box

yo i have just got reason and am knew to midi and getting mad confused......
i have m box pro tools , reason 4 ,mpc 2000,and a midi controller keyboard.
i have only got midi out on the back of my keyboard and have that going into midi in channel 1 of my mpc.
i have mpc going into mbox.
have my keyboard usb into my mac.
i have managed to sync mpc to pro tools but not to reason, the problem im having is, i cant hear any sounds from reason out of my mbox,i cant sample any midi sounds into my mpc from reason or pro tools ,but i can play midi on my keyboard with xpand with pro tools open, but not sample the sounds into my mpc and i cant play any sounds on my keyboard at all with reason.
BASICALLY I JUST WANNA USE MY MPC BUT BE ABLE TO USE REASON MIDI SOUNDS ASWELL.
VERY CONFUSED WOULD REALLY APPRECIATE SOME HELP THANKS.

thnks alot of help ........
now my problem is i cant hear reason through my m box or my keyboard trigger through my mxox anyone havea any ideas....
i have followed the steps to hook them up from the video and all good bt i just cant hear the sounds in reason therefore sample them into my mpc

thanks 4 ur responses appreciate it!
i worked it out it was just some settings on my mac and also in reason got it happening now cheers..