Hey Adam! Good job on going for the M-Audio Oxygen Pro MIDI Keyboard! I’ve really enjoyed it.. it’s given me a great FL Studio experience.
The best way to troubleshoot a MIDI Controller in FL Studio is by looking in the very top left of FL Studio’s hint panel. It gives lots of clues as you use FL Studio (while using a MIDI Keyboard, or just making beats in general!)
In the top-left of FL Studio’s hint panel, look for an orange knob light up when you press keys, or move sliders and knobs.. that will let you know if the MIDI Device is recognized within FL Studio.
If you’re not getting the orange knob in the top left of FL Studio’s hint panel, then go to your F10 MIDI Settings, and make sure the MIDI Keyboard is enabled.