Programming, Performance, and Conclusions A long row of rectangular keys just above the keyboard let you program controller information. I wouldn't have minded if the AC adapter was optional, but to remove the jack with it seems a bit excessive. That's not a problem with today's PCs, but it hampers compatibility with an iPhone or iPad, since third-party MIDI adapters like the IK Multimedia iRig MIDI (3.5 stars) assume AC power for the keyboard. In fact, there's no DC power jack, either. The Oxygen 49 comes with a six-foot USB cable, but no AC adapter. The Oxygen 49's back panel, meanwhile, features a standard-size USB port, a sustain pedal jack, and a power switch, with a Kensington-style lock opening on the right side for security purposes in student and educational settings. This is one place that even a slightly larger LED display would be helpful, though I suppose M-Audio has to save something for its more expensive Axiom line (which also features higher quality, semi-weighted keys and eight drum sample pads, among other upgrades). To the right of those keys, a 3-digit red LED display shows the currently selected parameter-usually with a range of 0 to 127, although it also shows octave and preset info. Four rubber keys to the right handle Track Select and transposition. Starting at the top left, there are two plastic pitch bend and modulation wheels, each one with a sizable finger indent. One of the reasons why the M-Audio Oxygen line has been successful for so long is its vast array of MIDI control features, and here the Oxygen 49 doesn't disappoint.
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