Fiber Optic Audio Input

Question for y'all. I have a Mac Mini and a MacBook Pro both with fiber optic audio in and out. I have often used the fiber out line to connect to my home theater system with no issues. Something I have wanted to do, however, is to record audio in through the fiber in. The downside is that when attempting to record using the fiber in line all I get is some popping or other similar noise but certainly not the audio I was trying to record. I did go into the system prefs and change the audio input to the fiber optic and that seems fine.
As a test, since I know the fiber optic out on both computers works fine, I even attempted to use one computer as the source and the other as the recorder and that wouldn't work either even though the fiber out of the source is active and good.
Anyway, would like to see what anyone has to offer and thanks in advance!

So you are saying that the app to record the audio coming through the audio in port recorded nothing, or are you saying you could not hear what it is recording?
To hear incoming audio you need the free app LineIn from Rogue Ameoba;
http://www.rogueamoeba.com/freebies/
Dah•veed

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