Check the listing for details. M-Audio 49-key MIDI Controller Keyboard with Aftertouch-sensitive Semi-weighted. Condition: New. Listed at 299.00 USD. The Oxygen Goes Pro Oxygen MIDI controllers have always offered excellent features and performance at an affordable price point. Now, M-Audio has taken Oxygen to the next level with Oxygen Pro, which provides everything you need to make music at a pace that keeps up with your professional creative workflow. It all starts with a newly designed velocity-sensitive, semi-weighted keybed with aftertouch and assignable zones. For beat production, clip launching, and more, Oxygen Pro is equipped with 16 backlit, assignable, velocity-sensitive RGB pads with Note Repeat. Oxygen Pro 49 and 61 feature nine onboard faders and eight assignable knobs and buttons; the Oxygen Pro 25 forgoes the faders and buttons in favor of a compact design that fits in your backpack.