m-audio revolution 7.1 audio interface revolution 7.1 is the ultimate audio upgrade for your pci-based computer. play dvds and all your music in surround sound, make games more realistic, and record or mix your own music. 7.1 surround sound output and high-definition 24-bit/192khz fidelity insure that you’ll experience it all the way that it was meant to sound. designed by m-audio — one of the biggest names in the pro music industry — revolution 7.1 packs all this advanced technology into a small pci card that’s a breeze to install and use.