M-Audio’s consistently popular range of controller keyboards has been updated for 2010 with the introduction of the third generation of the Oxygen series. It is part of an already well‑established category of products: it’s an entry‑level controller keyboard designed to be attached directly to a computer, and to be affordable and easy to use. It’s actually part of a four-product lineup, which consists of the Oxygen 25, the Oxygen 49, the Oxygen 61, and the Oxygen 88, with each number reflecting the corresponding key bed size.
According to several user reviews, they have praised M-Audio Oxygen 49 for the affordable, good value for money; Easy to use; DirectLink provides easy integration with supported software; Attractive, roomy design. Also, some users have complained it for not as robustly constructed as it might be; No physical MIDI ports; 3-digit LED is limiting.
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To restoring M-Audio Oxygen 49 to it’s factory settings, just simply power ON while simultaneously holding the Data – and + buttons.
Warning! This operation will cause will erase all user set-ups you have stored to memory. Do not use this function unless you are certain that you want to do this. This procedure also applies to the Oxygen 2nd Gen keyboards including the Oxygen 8 v2, Oxygen 49 (silver) , and Oxygen 61 (silver); as well as Oxygen 3rd Gen keyboards including the Oxygen 25, Oxygen 49 (blue), Oxygen 61 (blue), and Oxygen 88 units. Hopefully the article of “Reset M-Audio Oxygen 49 USB MIDI Controller” can help you.
Reference: M-Audio Oxygen 49 manual