On Mon, Sep 10, 2012 at 4:55 PM, jy <jypllx@gmail.com> wrote:

I'm tweaking around qjackctl's parameters right now.
I noticed that there is no MIDI driver (bottom left of setup panel) selected in my setup. Is that usual or should I set it to another value than none ?

the MIDI driver selector only exists to start up a "builtin bridge" between teh world of ALSA MIDI and JACK MIDI. neither of its options are good. you should use, as mentioned way up-thread:

a2jmidid -e

and yes, some developer should fix this pathetic state of affairs.