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Mac OS X 10.7.4 compatibility information
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Mac OS X 10.7.4 Compatibility Information – May 14, 2012
Apple has now released the OS X 10.7.4 update to the Mac operating system.  At this time M-Audio Devices and Drivers are not qualified for use on 10.7.4.  Please check for a compatible driver before installing operating system updates.  Before new device drivers are released, they are tested for use with operating system versions that are available at that time.  When updates for an operating system are released, all M-Audio device drivers have to be re-tested and possibly updated to ensure proper operation.  We recommend not installing operating system updates until a driver has been posted for that specific operating system.  Please check this article for up-to-date information about device qualification.
Note: Torq and Pro Tools are not qualified for use with 10.7.4 at this time
If you have already updated your operating system, or if you purchased a new computer that had 10.7.4 pre-installed, please share any feedback or compatibility issues in this discussion thread in the public beta section of our user forum:

Please visit http://forums.m-audio.com/register.php to register and create an account. Immediately after submitting your registration you should receive a confirmation e-mail with a link to activate your account; if you don't see it, check your spam/bulk e-mail folder. If after 10 minutes you have not received this e-mail; contact us and we can manually activate your account. If you are trying to post or download files and are getting logged out automatically, check the box "remember me" when logging in.

The following USB MIDI devices are class-compliant (plug & play); their drivers are part of the Mac Operating System and do not require additional drivers.  Simply connect the device to an available USB port:

Axiom 25, 49, 61
Axiom 25, 49, 61 (2nd gen)
Axiom Pro 25, 49, 61
eKeys 37
Keystation Mini 32
Keystation 49e, 61es, 88es
KeyStudio 25, 49
KeyRig 25, 49
Oxygen 8v2, 49, 61 (silver)
Oxygen 25/49/61/88 (blue)
MidAir 25/37
MIDISport Uno (current model)
MIDISport 1x1 (black top)
MIDISport 2x2 & 4x4 Anniversary Edition
ProKeys 88, 88sx
X-Session Pro
X-Session UC-17