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I'm trying to record from line-in but my OSX 10.9.1 does not seem to have a line-in device!? Both system preferences and audio midi only show build in microphone as input. Is this a known issue or what am I missing?

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Does your hardware have a line-in plug? – Hennes Feb 8 '14 at 14:02
I was told to use the 'microphone' plug. – LarsVegas Feb 8 '14 at 14:03

I know this is an old question, but I've had the same problem. If you have a Macbook Retina Pro, it doesn't have an audio line in built in as opposed to the next model down (without the Retina screen). I have no idea why Apple decided to remove the port from the Retina model, since it can't cost them that much.

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