Audio out from the input jack

topic decisions are hard... sorry if this is in the wrong place.
anyways, this is kinda simple. is there any way to naively use my audio input port to listen to on the macbook? by this i mean, plug in an auxiliary cable from an ipod, or even another computer, and listen to the audio it outputs?

You can use GarageBand to monitor any audio source that is connected to the Mac's input. Make sure your audio input is set to Line In in the Sound Preference panel. Then in GarageBand just select New Track and choose Real Instrument. In the Track Info box, set Monitor to On, and adjust the volume as necessary.
You can also use QuickTime Player to monitor audio if you get the QuickTime Plus upgrade ($30). Just select New Audio Recording and turn up the volume in the little Audio Recording window.
Audio monitoring is turned off by default to prevent feedback from the built-in microphone.

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