An interesting article on Renoise, my prefered tracker :
http://www.linuxjournal.com/content/renoise-linuxOnly one litle error in it, Renoise works perfectly with Jack and has multiple out's.
And even more important : Garitan confirmed officially that there will be a native linux version of Aria, there new sample engine !
This is big news in my opinion, it will be the first big commercial developper that will release an official linux product
http://namm.harmony-central.com/WNAMM08/Content/Garritan/PR/ARIA-Sample-Engine.htmlk