judging by the age of this thread I’m going to assume you already made the switch but just in case you haven’t ot someone finds this, I use KXStudio with ardour and it works brilliantly. I record full multitrack of every channel of my QU-24 into an old core 2 duo system and even that handles it well. I’m typing this while on a break from mixing something I recorded last sunday on the system. the only thing I have trouble with is getting midi fader control in ardour as mute buttons work fine but fader controls don’t