CD player Toslink optical out to optical digital audio in port. Need  help

Hello,
I'm taking the Toslink Optical out of my Sony 707esD CD player into the Audio in/optical digital audio in port of my March 2009 iMac.
In System preferences>Sound>Input>Digital in Optical digital-in port I see a signal occurring on the input level meter but I do not hear audio.
Output is headphones port and is working fine from other sources.
I see a signal input does anyone know how to hear the output.
Thanks.

You need the free LineIn app from Rogue Amoeba.
http://www.rogueamoeba.com/freebies/
Dah•veed

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