You're welcome to contribute one yourself. The GUI is far too complex
for LADSPA, but there's nothing particularly complicated about adding
file I/O to JAMin, itself. We just didn't feel like working on that.
There are so many good JACK-based solutions already available.
I might just try it. I fail to compile anything that wants QT3 (I do have
it and cannoct figure out why the ./configure cannot find it) but other
stuff will usually compile. If I do and can get that working, how do I
contribute it to the project?