I thought very long, that it don't support JACK. But I just ran ldd, and saw a dependency on libjack.so.0. And if I try to playback when jackd is not runing, it says, that could not connect to jack server. If server is runing, it doesn't produce any signals, but silently prefers alsa. I have JACK2 and tried both with jackdbus and legacy jackd. So, what is situation?