Thanks for making me discover Jaaa and Japa. I second the vlc plugin for Jack. But I would avoid mixing pulseaudio with Jack.
As for the "Entrée", so there is the mic input. To me it's normal, I mean I don't expect to see anything else.
But I'm no expert at this.Hopefully with the vlc plugin, vlc will appear in Qjackctl, and you might be able to connect vlc to Japa in "clients en écriture". At least that's what I understand.
