MacOS – Audio Input not working on 13-inch Macbook Pro Mid 2012

audiomacbook promacos

I am trying to connect an audio device (analog synthesizer) to the input of my 13-inch Mid-2012 Macbook Pro running OS X Mavericks 10.9.3. The synthesizer's output is a standard 1/8th inch stereo plug. According to http://support.apple.com/kb/ht3625, I should be able to switch this from System Preferences. However, my screen looks like this even when my device is plugged in:

Screenshot

There is no option to use the audio jack as an input.

How do I connect my device to the audio input?

Best Answer

From the technical specification:

Audio

Stereo speakers with subwoofer
Omnidirectional microphone
Headphone port
Support for Apple iPhone headset with remote and microphone
Support for audio line out (digital/analog)

There is no direct "microphone in" or "line in" connector. The only way to connect a microphone is to use a splitter meant for iPhone and similar devices, like this one. You should note that the input is mono only, no stereo support.

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