How do I monitor the Line-In (Analog) input via my connected speakers?

I'd like to do this in order to hear audio coming from another device on-top of the audio already coming out of my Mac. On a Windows box, I would simply mark the checkbox for the input in the sound settings and the input is heard over attached output speakers, etc.
Beavis2084

Check the volume setting in the "Input" tab of "Sound" system preference. If it's still too low, run Audio MIDI Setup (Utilities folder. Set "Properties For" to the audio input and make sure the Audio Input sliders are all the way to the right. The Mac uses line-level audio input, so if you are using a microphone you may need a per-amp or iMic
<http://www.griffintechnology.com/products/imic/>

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