I figured somebody out there ran into the same problem as I have.
I recently purchased a Samsung Plasma PN50C550G1F and I'm programming my harmony remote. There are times I want to use the TV speakers and other times use my surround sound. When I use my surround sound I want to turn off the TV speakers. Normally I would just use the mute command however the TV constantly displays the mute icon. So I'm looking for a workaround. I found in the tv menu a way to switch internal/external speakers which would work. However, right now I programmed the remote to navigate through the menu which is slow, clunky, and error prone. I would like to find out if there is a discrete code to toggle this or if there is another code I can use to turn off the TV speakers without constantly displaying the icon.