Jack and GNURadio?

Coming close to finishing a flowgraph I have been working on for some
time, all is well and it works just fine with pre-recorded WAVs for
testing some parts, however there is one little snag.

Jack is needed for three inputs in this graph. There is but one Audio
sink and despite using the asoundrc method of routing ALSA applications
to JACK, it refuses to work. I recall there being work on a JACK
source/sink some time ago but haven’t heard a peep about it for a good

Anyone have any success getting JACK to play nice with your
applications? If so, how? I would appreciate your insight.