CM and Macintosh MIDI Communications

[Mary Simoni]

I cannot seem to establish MIDI communications using cm on a PPC Macintosh
running OS 7.5.2., MCL3.9, OMS 2.2, MIDI Manager 2.0.1 and Patchbay 2.0.1.

Whenever I try to open MIDI communications from with cm, I get:
? 
; Warning: MIDI: no known midi driver with open ports available.
;          Check the cm:*midi-preferences* parameter and/or PatchBay to
;          see whether your driver is included and has any ports enabled.
;          
;          Type y(es) if you could fix the problem, or n(o) to cancel.
;          
; While executing: %MM-GET-DRIVER-AND-PORTS

Retry opening/connecting to a midi driver? (y or n)  

The value of *midi-preferences* is:
? *midi-preferences*
((:APPLE :MTP :OMS :MIDIQT) (0 1))

Patchbay shows cm but no MIDI communication.

OMS Studio Setup says the MIDI Port is in use by another application.

I think I've read every README and see no clues. 

What's wrong?