Reaper 5.20 beta 10 has a native linux build for the first time ever. There is also an armv6t2 build for the raspberry pi 2+.
This is the first good DAW available for linux, ardour doesn't count as it is an open source rubbish daw.
It costs $60 for non-commercial usage.
More info: http://forum.cockos.com/showthread.p...t=linux&page=8