Mini-HDMI Port: Video OK, sound only works for iTunes

Let me start by saying, I'm pretty new to Mac so please be gentle with your answers...
I just got a new HD Samsung TV and have connected it to my Macbook Pro through the Mini-HDMI port. There are two HDMI inputs on my TV, DVI and ARC. I'm using DVI. The video displays perfectly but I'm having a little trouble with sound.
Once I went to system preferences and switched the audio output method to "SAMSUNG - HDMI" my iTunes music began playing through the TV speakers. I played a .wmv video from my hard drive; sound and audio all worked well. However, when I attempt to play anything through the Internet, Youtube, Hulu, Pandora, no sound... I still get video, and if I switch the Output source back to "Internal Speakers - Built-In" there's no problem. I don't know if it makes any difference, but I'm using Google Chrome as my Internet Browser.
I've double/triple checked the sites to make sure the local audio levels aren't being muted, and that doesn't seem to be the case. Is there a setting somewhere that references only Internet, or more specifically, Google Chrome audio Output levels?
PLEASE HELP...
Thanks

The "Front" channel isn't the same thing as the front panel. From the ALSA wiki:
"Front, Surround, Center, LFE (subwoofer) and Side (these are the names of the channels with Intel HD Audio, they may vary with different hardware)."
How many sounds cards do you have?
[dspider@arch ~]$ aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: NVidia [HDA NVidia], device 0: HDA Generic [HDA Generic]
Subdevices: 1/1
Subdevice #0: subdevice #0
[dspider@arch ~]$
What are the other HDMI devices? The video card?
And have you tried googling the problem?
http://ubuntuforums.org/showthread.php?t=1462288

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