Hi Shep,
I'll confess to not having used MidiOx personally, but I think (from what I recall) that you'll need to have virtual MIDI cables set up to connect it to other MIDI apps/devices.
If you don't have any virtual MIDI cables installed, you can
see this other thread.
If (or after) you've got virtual MIDI cables already installed: To try to force Composer to recognize a MIDI device after starting the MIDI device and then Composer:
1. Setup/MIDI Device Configuration (not the Quick one).
2. Config/Initialize - this makes Composer search for open MIDI devices.
If you need to manually add a device,
1. Setup/MIDI Device Configuration (not the Quick one)
2. New External Device (the virtual cable is considered "external")
3. Enter the info.
Hope this helps, or perhaps even better, that some of our other musicians who regularly use MidiOx might chime in.
ttfn,
Sherry