Why are you using MIDI OX? My understanding is that it works as a virtual MIDIdeviceand allows for routing of MIDI signals. It’s software MIDI.
If you have hardware MIDI devices, is there a reason you need MIDI OX to see them?
I’ve not used MIDI OX. I’ve used LoopBe, which I think is similar. I bought it so that I can have software send MIDIsignalsto Renoise (and vice versa). But LoopBe never needs to use the sound card because I don’t use it to interact with MIDI hardware.