http://www.miglia.com/products/audio/harmonyexpress/index.html

LITERAL:
Barely the size of a USB memory stick, Harmony Express™ is a a fully featured sound card that connects to your USB 2.0 port.
Simple to install, Harmony Express™ let’s you enjoy the incredible sound quality of your speaker system to its full extent, thanks to its virtual 5.1 output support.
The compact design and ease of installation through USB makes it an ideal add-on for your portable and desktop computers.