To further answer your question - usually there are 4 means of getting the audio from your computer to the Dac.
1. USB (my prefered) (Do not use a usb hub)
2. Optical digital (Toslink) (2nd best option as it's not as susceptible to emi but still can have jitter issues and not all computers have optical out.)
3. SPDIF coax digital (Prone to EMI and other noise and jitter from computer internals)
4. Headphone out. (worst case option, you wouldnlt connect this to your dac, just direct to amp)
Most people use a 3rd party media player. Foobar 2000 with wasapi output. Jriver mediacenter and mediamonkey. Itunes is usually a last resort for most people. There are other players that people like but I haven't experienced them so cannot comment on their usefulness/quality.
Also, there is a Lyr for sale in the forums with a bunch of tubes HERE looks likes a decent deal.
Hope this helps..
yea it does thanks again!
unfortunately I live in Canada so I can't really get that but yea it does look like a great deal