A few audio Linux distros. Have you installed and tested any of these?
64 Studio develops a distribution of native free software for digital content creation on x86_64 hardware. It's based on the pure 64 port of Debian GNU/Linux, but with a specialised package selection and lots of other tweaks. We also produce custom versions for our OEM partners, and a 32-bit edition for legacy PC and embedded hardware. Curious? Read what People Say about 64 Studio.
dyne:bolic is shaped on the needs of media activists, artists and creatives as a practical tool for multimedia production: you can manipulate and broadcast both sound and video with tools to record, edit, encode and stream, having automatically recognized most device and peripherals: audio, video, TV, network cards, firewire, usb and more; all using only free software!
an openSuSE media-optimized Linux distribution
The Studio to Go! software series provides a complete introduction to the amazing world of Linux Audio and features a integrated audio and compositional environment on a single bootable disk.