my inbuilt audio control panel keeps disappearing from the system tray for some reason. It's annoying because I loop my 360 through the line-in and so I need to control the volume for this port separately from Windows volume.

The last time the realtek audio was updated on the Asus page for this motherboard was back in 2007 though - and I have this version.

Can I use the the more recent HD audio stuff on the Realtek website - it says this

Audio drivers available for download from the Realtek website are general drivers for our audio ICs, and may not offer the customizations made by your system/motherboard manufacturer. To be sure you obtain the full features/customizations provided in your original audio product, please download the latest drivers from your system/motherboard manufacturer's website.
though

Will this version work with the P5W?