For my multi track recording Ive always used ardour on linux, which ever flavour of linux ive used from the begining in fact! its nice to see version 3 released. Very polished and has facilty to be controlled from mobile devices such as my nexus 7! anyway if you have ubuntu 13.04 and want it follow these instructions from a terminal
sudo add-apt-repository ppa:kxstudio-team/ppa
sudo apt-get update
sudo apt-get upgrade
sudo apt-get install ardour3
sudo apt-get update
sudo apt-get upgrade
sudo apt-get install ardour3
Worked for me a treat! enjoy 🙂