Midi, No MIDI in? Options

[lunar 1]

I am trying to record my Sax into Cubase SE. The route is this:
From a Macki mixer, to an OMNI i/o, thrugh a Quattro Midi interface, Midied into a Roland SS88 keyboard Workstation, and on into Cubase in my Mac, useing OSX, Via USB from the Quattro. I can play Midi files thrugh this system out to the mains, But playing the keyboard or the Sax back into the Compuiter isn't working. I have checked all my settings over and over again. Midi thrugh, Local off, Midi soft thrugh, ETC. I have two Midi cables IE. IN and OUT. It seams that I have no Midi signal going back into the compuiter from the Quattro. The OMNI i/o is what I'm using for the Sax.
Is this problem between the Quattro and the Compuiter? Or what? Your help would be great.

[lunar 1]

Well, I changed things around a bit, and low and behold. MIDI RECEIVED ! MIDI OUT ! AUDIO IN, AND AUDIO OUT! One thing I did was: In my misery and discouragement I opened an old program called Melody Assistant in OSX and BADA BING! Everything worked. I haven't given up on Cubase yet. I think it could be a good program. However I will set it aside for the moment.
Thanks for your input kaboombahchuck But I knew I had the right drivers. By the way what program do you use? Been playing Sax long?
My buddy and I broke everything down and reconnected it all. The only problem is that we did so many things that I don't know what we did to fix it. I do know that the Melody Assistant came right on line with everything working first try. I should do some more reserch on editing programs and find something that works for me.
Thanks for your imput guys this is a good place.