I don’t know the specs on
I don’t know the specs on your TV or HTPC so this may or may not be an option. There is the potential for audio lag with this depending on hardware, etc.
1) TV needs to have audio throughput. For example on my TV, I have all my devices plugged into the TV’s HDMI ins and the TV has both left/right audio outs and Coaxial digital outs from the HDMI’s audio signal. Not all TVs support this, but a lot of the newer ones do.
2) Your computer needs to have digital audio input.
3) Run the game console via HDMI into the TV. From the TV, run the coaxial digial out into the computer’s digital audio in. Run software on the computer to play the audio off the digital audio in. Hope that any lag from this isn’t noticable…
Assuming you have the connectors needed to set it up this way, worse case, it costs you a dollar or two to a buy cable to hook it up and try it out(assuming you don’t have a spare cable laying around).