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My usb keyboard controller (M-Audio Keystation 49e) worked fine once I updated to El Capitan for 1 month.  Now it’s not recognized.  What Happened???   Are there any recommendations?

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My usb keyboard controller (M-Audio Keystation 49e) worked fine once I updated to El Capitan for 1 month.  Now it’s not recognized.  What Happened???   Are there any recommendations?


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