ArchStudio is a collection of binary packages for professional audio work under GNU/Linux.
ArchStudio itself is not a linux distro; it is an extension for 64bit ArchLinux systems.
To enable it you should follow the instructions under Install.
ArchStudio is strongly linked to the ArchAudio project, that I’m also a contributor.
One important diference is that all packages in ArchStudio are optimized for the Intel Core i3/i5/i7 processor family.