Quote:
Originally Posted by OutdoorXplorer 
I have this apple's dock and it sounds horrible as it is not a true line out.
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Quote:
Originally Posted by Lil' Knight 
It's not the true lineout. Only like the headphone out,you can still adjust the volume by its remote.
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The one I have, that came with my 4G, is a true line out and sounds good.
Just because you can adjust the volume doesn't mean it's not a line out. There could be a pot in the dock, making it a very basic preamp. If the volume adjustment of the iPod doesn't effect the volume off the output via the dock, it's a true line out.
One problem I have with my current iPod, 160GB, is that if I supply power through the dock, the line out picks up noise from the drive spinning. It's very annoying and means I can't charge and listen at the same time.