Storing Calf plugins presets?

[kakofonyx]

Hello, I use Qtractor with Calf Plugins and I don't know how to store their presets. Do I miss something?

EDIT:
Ok, so I see I can change and store presets using Calf Jack Host, however in qjackctl it doesn't appear in "Alsa writable clients" but in "MIDI writable clients" so I can't send midi data to it from Qtractor.

EDIT2:
I also tried KXStudio and the Qtractor version which is there shows properly the menu bar of Calf plugins (so I can chose presets), but Qtractor in Debian doesn't.
Any solutions?