Been looking at the 1820M PCI Audio Recoding Interface.

http://www.emu.com/p….asp?product=9871

Can anyone answer these questions?
Can it convert optical 5.1 input to 5.1 analog speakers?
Does it work fine with Vista x64?
Where can I buy it (will buy second hand!)?
What's the difference between this and the 1616M?

Thanks to anyone who can help in advance,
Dan