... AND/OR you can drag the file "OMS MIDI Manager Driver" file to your System folder if you plan to use OMS in paralell with Aple MIDI Manager and also let OMS to manage external MIDI devices.
"OMS MIDI Manager Driver" is on MacTron Xtras folder inside Ballade folder.

...drag the file "OMS MIDI Manager Driver" file to your System folder if you plan to use OMS

You have to put "OMS MIDI Manager Driver" file in to your System folder (not Extensions folder).
Restart your computer and then configure your connections (with OMS apps also)  in PatchBay.
You can take a look in to the down-right part of the picture:

Click to Enlarge...