Questions about USB sound blas

I just got the Creative USB Sound Blaster Audigy 2 NX, and I simply love it. It was well worth the $0 I paid for it with a gift card I had to blow anyway. I have come to expect quality from Creative, through 2 sets of speakers, an MP3 player, and now a USB sound device.
I do have a question though. I've got USB . in the machine I use the device in. I'm wondering if it would make any difference to use USB 2.0?
Also, there was a very large cable that came in the box that I couldn't find out what it was. Do I need this cable? My music is working great right now, but I'm wondering if I need that cable.

The USB-6008 is supported by both DAQmx and DAQmx Base, so you can
definately use a USB-6008 with Visual Basic 6 through the DAQmx
API.  Information on how to get started can be found at this link:
http://digital.ni.com/public.nsf/websearch/B22FE2B0F9C8935286256E920073DA07?OpenDocument
While the DAQmx driver is the preferred API under Windows, you may also
use the DAQmx Base driver with VB 6 if you prefer.  It is slightly
more work to set up however.  Instructions on how to do that can
be found at the following link:
http://digital.ni.com/public.nsf/websearch/A21A013CA229A5988625703E0025A8AE?OpenDocument

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