Impedence and various inputs

Can someone explain to me what impedence is? Also, I have a Presonus Firepod.  It has three kinds of inputs:  mic, line and instrument.  What is the difference between them and does it make a difference for sound quality if

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Re-Amping and Splitters

Wise One: Can you explain to me how one would send a pre-recorded guitar track (for example) to an amp?  Does one need a re-amping device to do that?  Also what does line level mean? One records one guitar through two amps

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