HT3625 Macbook pro 13 2012 not showing line in audio when connected to preamp

I have a preamp connected to the audio in/out jack on my macbook pro 13" 2012. when i plug the audio in from my preamp the sound only shows it as a headphone output and does not list it under input. i also have no button "use audio for:"

You should also ask this in the MacBook Pro forum. This is the forum for the white and black plastic MacBooks that were discontinued in 2010. You should also post this question there to increase your chances of getting an answer.

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