I will be purchasing the Z-5500 speakers soon, and would like to set it up so that I'm getting actual 5.1 all the time, from every application, including itunes and quicktime. I was looking at the Griffin Firewave, but then discovered that it's no longer supported (no drivers since 2008). Will connecting the Z-5500 to the digital optical out port give me real 5.1? Where do I get that cable? And if not, what are some good external sound cards like what the Firewave was, that actually work and are simple to use? Thanks!