AV Linux is a versatile, Debian-based distribution featuring a large collection of audio and video production software. Additionally, it also includes a custom kernel with IRQ threading enabled for low-latency audio performance. AV Linux can be run directly from a live DVD or a live USB storage device, though it can also be installed on a hard disk and used as a general-purpose operating system for everyday tasks.
http://www.bandshed.net/avlinux/