I've been trying out the newly improved JACK support in Audacity and
can confirm that it does work. If other people could give this some
testing I'm sure it would help solidify the feature. Please consider
joining the audacity-devel list and sending feedback.
To build Audacity with JACK support you need to do this:
cvs -d:pserver:email@example.com:/cvsroot/audacity login
(hit the enter key when it asks for a password)
cvs -z3 -d:pserver:firstname.lastname@example.org:/cvsroot/audacity co
(the above is all one line)
./configure --with-portaudio=v19 --without-portmixer
(edit src/Makefile and add this to the end of the LIBS line if it's
Then make and make install as usual. Start JACK, start Audacity and
you should have a JACK option in Preferences under Audio I/O. You may
need to disable the VU meters to get reliable playback on a slow
machine - that option is on each meter's drop-down menu.