johannes@localhost ~ $ sudo chmod a+rw /dev/input/event*
johannes@localhost ~ $ mixxx &
[1] 1754
johannes@localhost ~ $ Debug: Starting up...
Debug: MidiObjectOSS: Open of MIDI device /dev/midi1 failed.
Debug: Alsa getapi
Debug: Alsa constructed
Debug: Alsa initialized
Debug: type signal
Debug: type marks
Debug: type signal
Debug: type marks
Debug: playlist name Default
Debug: MidiObjectOSS: Open of MIDI device /dev/midi1 failed.
Debug: Alsa opening pcm_open: mixxx
ALSA lib pcm.c:2145:(snd_pcm_open_noupdate) Unknown PCM mixxx
Warning: Playback open error: No such file or directory

Debug: Alsa getinter
Debug: Alsa getsample
Debug: Apply
Debug: request msec 225
Debug: Alsa opening pcm_open: mixxx
ALSA lib pcm.c:2145:(snd_pcm_open_noupdate) Unknown PCM mixxx
Warning: Playback open error: No such file or directory

Debug: Alsa getapi
Debug: MidiObjectOSS: Open of MIDI device /dev/midi1 failed.
Debug: Alsa destroying...
Debug: Alsa destroyed
Debug: Write track xml
Debug: delete tracks
Debug: delete view
Debug: save config
Debug: delete config

[1]+  Done                    mixxx