Translations:ALSA/246/en
From Gentoo Wiki
It is possible to interconnect JACK and ALSA. At that time of writing, the best solution and it look like to be the final one, is via the snd-loopback module and the jack ALSA plugin. For that, see JACK#ALSA - Bridging ALSA and JACK together. See JACK — describes the setup of a playing sound with JACK (JACK Audio Connection Kit)..