Midi In Osx, Dated hardware integration question Options

[danin7seconds]

I recently purchased a G4 400 to replace my 7100. I have an Opcode Studio 4 MIDI interface and some outboard gear connected to it. The interface is connected through a GeeThree Stealth Serial Port. I'd like to use OSX for my music production.
The problem:
Audio MIDI Setup will not recognise the Studio 4 as having more than one port. When I boot up in OS9.2 OMS recognises it just like it should. In OSX when I try to run any OMS app Classic starts up then the app promptly freezes.
Questions:
1. Is it possible for AMS to co-operate with my MIDI interface?
2. Is it possible for OMS to run under OSX?
3. Do I need to stick with OS9?

any help?

-Dan