If you haven't already, please go to the Drivers & Updates page of the M-Audio website to download the latest Oxygen Pro preset mapping file for Logic Pro.
Once downloaded, a .pkg file will appear in the downloads folder of your Mac. Double click on it and go through the onscreen steps to install the mapping file.
After the installation is finished, please follow the steps below...
1. Open Logic Pro.
2. Select Logic Pro in the top-left corner of your screen.
3. Go to Control Surface > Setup.
4. Click the dropdown button labelled 'New', then click Install...
5. In the Install window, select the Oxygen Pro 49, then click Add.
6. Go back to the Control Surface window to see the new Oxygen Pro preset mapping file added to your Control Surface list.
7. Select Logic Pro in the top-left corner of your screen.
8. Go to Settings > MIDI...
9. Select the Inputs tab and ensure that the boxes corresponding to your Oxygen Pro are ticked.
Following this, the Logic Pro 0.5 preset mapping file will be loaded when you connect your Oxygen Pro to Logic Pro.
A full setup guide for Logic Pro using Mackie/HUI can also be found here: M-Audio Oxygen Pro Series | Setup in Logic