Wow, thanks an absolute ton man. Can't even explain how thankful I am to have gotten this info..
No HD though
Only 480i with a composite cable (yellow red white)...
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EDIT
Hang on...
Since the turtle beach only needs the sound jacks...
BUY A AV-COMPONENT CABLE!
The only difference is that you'll have 3 video jacks instead of that single yellow one. And you also won't have to enable the composite option in the software. The jacks for the sound have the same colour and are next to eachother (don't confuse the red video jack with the red audio jack!)
Aaaaand it can carry signals with higher resolution, therefore you'll be able to record in HD!
This should result in a muuuuuch bettter vid quality, definitely worth a try! Resolution is up to 1080p/i then.
EDIT 2
Oh, he even mentions this in the video...
EDIT 3
Oh and the most important thing: Without component cable, you won't be able to play in HD. Following you really need one.
Doesn't have to be this one, I'm sure cheaper ones are available.
Btw, I'm sorry that I told you that you don't have to buy anything. I didn't think about the resolution problematic.