"ProStation Audio" comes with the Pegasos as part of the SuperBundle and is ideal for professional multi-track editing. I know a version of Bars'n'Pipes is being worked on too, but hasn't been released yet. I am not really an audio expert so not sure about hardware, but the built in sound is quite nice.
You might want to see my review if you are new to the Pegasos platform for some additional info and links too. :)
