I purchased the M-Audio Oxygen 49. It looks great. Do you have an instructional video that specifically shows how to set up the Oxygen 49? It's kind-of complicated!
As discussed in our emails, the M-Audio Oxygen Pro (Review) is the MIDI Keyboard I recommend (and I'm glad you got the Oxygen Pro!!)
Here's some resources I have to get the Oxygen Pro setup in FL Studio:
Oxygen Pro Video Series - This helps the user understand what a MIDI Keyboard is, why the Oxygen Pro is a great MIDI Keyboard for FL Studio, and how to setup the Oxygen Pro for FL Studio usage. It breaks down the FREE MIDI Script, and additional premium add-on (if you want that).
Oxygen Pro FREE MIDI Script - Out of the box, the LOOP Button of the Oxygen Pro was not the default operation of what I know a MIDI Keyboard to be in FL Studio. (The FL Studio MIDI Script gets that set up).
Update Oxygen Pro Firmware - If you just bought your Oxygen Pro, it may be on an old firmware. I don't think it's necessary to update, as I didn't experience any bugs.
Premium Oxygen Pro Preset (Add-On) - Sets Oxygen Pro to External, sets knobs/sliders to proper MIDI specs (and changes drum pad colors over banks), and V2 allows for a cool hands-on workflow!
Here's step-by-step details for how to set up the M-Audio Oxygen Pro for FL Studio.
The M-Audio Oxygen Pro doesn't have drivers, but best practice is to install drivers first for any hardware you plug into your music production computer!