Hello Misonic, welcome here.
I am not sure that what you call USB midi is intended to receive midi notes from external midi source. But I may be wrong on that.
My own synths with midi in out + usb can send or receive midi data on usb but can not be used as midi devices receiving notes or CC with usb.
I have to use the midi in/out 5 pins in order to operate properly.
Maybe your synth have a more advanced midi usb technology, you might request information from Novation support.
If it is not possible with usb, you have to use standard 5 pins connections.
If your sound card have midi in/out it will works fine.
If no midi in/out, you have to use a midi/usb interface.
Several models exist with more or less options.
I use a Midi expression iO that allows using midi connections plus 4 standard controllers such as expression or sustain pedals, switches, etc, for patches changes and all midi learn parameters.