Midi Routing, how can i play my Akai...? Options

[sonoton]

I've recently bought an Edirol PCR30. I've had no problem to play/control softsynth (reason,pro52,fm7....) via IAC bus but i can't find a way to play/control or record my Akai S3000 into PTF.
This is my setup

*iMac DV 400Mhz

*MOTU midi express XT
midi 1: Akai S3000
smpt in : Umatic video deck

*Edirol PCR30
usb port

I'm not sure where my sampler should be in my setup ( to play/record in PTF).

I've tried with using the physical midi port O/I on the Edirol to O/ I on the sampler -no success. I've tried daisy chained the Edirol and Akai to the midi 1 of Midi express, but...nope.....
Could that be my OMS settings?

I don't know it seems like i've tried so many things... i'm a bit confused.

I would appreciate any fresh thoughts to my problem

Thanks in advance