Realtek Digital Output

I have a Satelitte A505-S4060, Windows 7 (64 bit).
In my sound options I have "speakers" and "realtek digital output".
If I set speakers as default device I have sound.  If I set it to "realtek digital output" I have no sound.
When I select test for realtek digital output, I see the bars moving but I don't hear any sound.
What exactly is realtek digital output?
Is it another way for me to play sound?
If so, any suggestion to get it working again?
If it is a matter of deleting and adding drivers, how do I do that and where would I download the driver from?
Thanks so much.

In 'Control Panel - Sound - Playback tab'  where you select 'Speakers', underneath the word Speakers but part of that same selection you will probably see 'Realtek High Definition Audio'
The 'Realtek Digital Output' selection is for when you use S/PDIF digital output, which can use the same output jack as your headphones:
http://en.wikipedia.org/wiki/S/PDIF
http://en.wikipedia.org/wiki/TOSLINK
You would need a set of S/PDIF digital speakers and a TOSLINK adaptor cable to be able to use this option.
Mike

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