erm, ur pioneer avr only have 1 hdmi input?

i dont think xbox360 has optical out. only hdmi and their proprietry cable out to component or vga.

if your pioneer accepts more than one hdmi, then plug ur xbox360 hdmi to the pioneer avr and output to the tv. sure surround

or u can get this : http://cdn1.gamepro.com/article_img/gamepro/110489-9.jpg

wonder the output will be surround tho.

mine doesnt have just hdmi and the proprietry ones. prolly mine is the older version