Comment 9 for bug 500119

I don't know if this will help but

in wikipedia for MLT http://en.wikipedia.org/wiki/Media_Lovin%27_Toolkit it says it is modular with jack.

"Modules

    Integration with many libraries for multimedia including FFmpeg, Jack, LADSPA, SoX, SRC (libsamplerate), frei0r, GTK+, Qt, and SDL"

This might help on the coding side of things.