hello i’m on linux ubuntu studio 13.10 an i use audacity 2.0.3 and i try to interface with jack but i didn’t good in this domain if you have some answers thank’s in advance
See if this helps: http://wiki.audacityteam.org/wiki/Linux_Issues#JACK .
If you still have problems after that, please try to describe exactly what you are trying to do and what goes wrong when you do that.
Gale