Quick technical question about audio options on an Xbox 360


So I was thinking of getting a replacement for my RROD’ed 360 and need a quick survey of hardware versions. If you are able, please take a look in the system settings and check out if Video and Audio can be routed separately. What I would need to do to make this work is to have my video piped through an HDMI cable to my monitor and the L/R audio piped to my speakers, as both are currently hooked to a switch box to share with my PC and my PS3. If you can, take pictures of the options as well!