I have some issues

I have an external Yamaha S08 as my MIDI controller. I connected the MIDI controller with MIDI <OUT> to 828mkII MIDI <IN>. I have the Firewire from 828mkII to my Powerbook G4. I have been able to detect MIDI in the Audio/MIDI setup. I was using a Motif Rack before and it all work, but since I replaced it with MachFive I'm completely clueless.
I don't know what I'm doing honestly... if someone could help me I would really appreciate it!!! I've spent countless hours trying to get my new setup to work and no luck! I'm assuming it could be the way I'm setting up the tracks etc. But I don't know. PLEASE HELP!!!
Thanks Guys!
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iMac 2.0GHZ, 2GB
Powerbook G4 1.67GHZ, 2GB
Digital Performer 5
MOTU 828MKII
MachFive 2.0
Yamaha S08