USB 2.0 is USB 1.1 backwards compatible. Not a problem. But your device is likely limited to 2 channels, 16 bit, and 48kHz, since that's about all that 1.1 can handle. USB 2.0 can handle more (2x 24/96), but still fairly new in terms of available audio hardware. Even the 2.0 audio standard was only recently finalized. < 3 years? Several years after 2.0 was in the wild. With USB 3.0 in the wild now. But still not that common.