I have been looking at USB sound cards. I have heard that it is better to run a separate sound card for digital modes to keep windows sounds of the air. This is a good idea and I guess that is what SignaLink interfaces' have going for them. I have always built my own or just recently started using the SCI-6 PC Sound Card Interface Kit from Unified Microsystems. This USB sound card makes a cleaner waterfall display than my laptops built in sound card. I am very impressed with the quality of this sound card. Only time will tell if it is durable enough to last. This sound card was less than $4.00 shipped. These can be found on Ebay and some other places on the Web.
USB 2.0/1.1/1.0 Compliant.
Plug and play USB device, Auto driver installation.
Drive two channels speakers directly.
Support 3D positional sound and virtual 5.1 Channel soundtrack.
Digital Class-B power amplifier inside.
LED Status indicator
Works with Windows Vista/XP//2000/ME/98SE