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Axiom Air 49 with Pro Tools 11 not working on IMac running Yosemeti

I cannot get Pro Tools 11 to work with the M-Audio Axiom Air 49. Using Yosemite on an IMac. Comp recognizes the keyboard, as I'm able to use the Ignite program included. Midi peripherals also recognizes the keyboard, and I've followed these (http://m-audio.com/kb/article/1660) instructions to a tee, but still nothing happens when I play the keyboard after creating an instrument track. I've done the factory reset as well.

Any help would be greatly appreciated!!!!
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