Just go into the Volume Control Panel and unmute the Line-In in the playback dialog. Then you will hear the line-in along with whatever is playing on the computer.
Mixers are a lot easier to use than it looks like. There is an input gain (volume), balance pan, and EQ for each input channel. And a mixed volume output. Knowing that will get you most of what you need to know. Of course there are a few other features, but they are easy to learn.
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