Its a live linux distribution, you burn it into a CD or a thumb drive, boot your pc, and plug your guitar. Then you'll be able to use rakarrack which is a realtime effect box.
But thanks for the advice, I'll update the opening sentence
"It has a real-time configured kernel and the whole system configured to obtain the smallest latency possible. Everything is configured (or at least should be) to work out-of-the-box."
... which doesn't mean anything to anybody except you.
Work on that "elevator pitch" description carefully. Get it down to 10 words, then stick it up top in 36 point font so that people stumbling across your thing can figure out what it is.
This is a system (obviously a linux one) configured for low latency (save me lots of time and messy config) work out of the box (no other download required to go and play)... say no more, i get it.
But i agree that i was looking for something more elaborated, something which tell me exactly what it use and what it does. Why should i use it over ubuntu studio etc.