Hello.
This is only tested in 2.3, but I think that it isn't fixed in 2.4,
since I haven't seen it reported anywhere.

When you boot seq24 from the menu, it won't interface to jack properly
so ther wont be any ports for you to connect to in qjackctl. This is
fixed by booting seq24 with the --manual_alsa_port option.

Hope that isn't fixed yet (erh..).

Gasten