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]

Boy, are we having fun with this one or what? I'm sorry I should have said that I'm having TWO, TWO SEPREATE problems. One with MIDI and one with AUDIO. My MIDI link was not a compleet loop untill I It appears that the USB hubs in the back of the tower aren't good for Midi, however when I plug into the USB jack on the keyboard witch is plugged into the same USB jacks in the back of the tower that wouldn't work, I get those lovely words, MIDI RECEIVED. Go figure. So now the loop is complete in OS9 MIDI IN and MIDI OUT. However in OSX I still have a problem.
Now as for the AUDIO, I was told that I could record AUDIO into the Computer by the OMNI i/o. I guess that I will just use the Mike in. It seams that that is the simplest way.