This is the messages on Jack.. IDK if this would help..
(qjackctl:6837): Gtk-CRITICAL **: IA__gtk_widget_get_direction: assertion 'GTK_IS_WIDGET (widget)' failed
(qjackctl:6837): Gtk-CRITICAL **: IA__gtk_widget_get_direction: assertion 'GTK_IS_WIDGET (widget)' failed
(qjackctl:6837): Gtk-CRITICAL **: IA__gtk_widget_get_direction: assertion 'GTK_IS_WIDGET (widget)' failed
(qjackctl:6837): Gtk-CRITICAL **: IA__gtk_widget_get_direction: assertion 'GTK_IS_WIDGET (widget)' failed
11:46:38.641 D-BUS: JACK server is starting...
Cannot connect to server socket err = No such file or directory
Cannot connect to server request channel
jack server is not running or cannot be started
(qjackctl:6837): Gtk-CRITICAL **: IA__gtk_widget_get_direction: assertion 'GTK_IS_WIDGET (widget)' failed
(qjackctl:6837): Gtk-CRITICAL **: IA__gtk_widget_get_direction: assertion 'GTK_IS_WIDGET (widget)' failed
11:46:38.663 D-BUS: JACK server was started (org.jackaudio.service aka jackdbus).
Mon Feb 9 11:46:38 2015: Starting jack server...
Mon Feb 9 11:46:38 2015: JACK server starting in realtime mode with priority 10
Mon Feb 9 11:46:38 2015: self-connect-mode is "Don't restrict self connect requests"
Mon Feb 9 11:46:38 2015: Acquired audio card Audio2
Mon Feb 9 11:46:38 2015: creating alsa driver ... hw:MTrack,0|hw:MTrack,0|128|2|44100|0|0|nomon|swmeter|-|32bit
Mon Feb 9 11:46:38 2015: Using ALSA driver USB-Audio running on card 2 - M-Audio M-Track at usb-0000:00:1d.0-1.2, full speed
Mon Feb 9 11:46:38 2015: configuring for 44100Hz, period = 128 frames (2.9 ms), buffer = 2 periods
Mon Feb 9 11:46:38 2015: ALSA: final selected sample format for capture: 24bit little-endian
Mon Feb 9 11:46:38 2015: ALSA: use 2 periods for capture
Mon Feb 9 11:46:38 2015: ALSA: final selected sample format for playback: 24bit little-endian
Mon Feb 9 11:46:38 2015: ALSA: use 2 periods for playback
Mon Feb 9 11:46:38 2015: graph reorder: new port 'system:capture_1'
Mon Feb 9 11:46:38 2015: New client 'system' with PID 0
Mon Feb 9 11:46:38 2015: graph reorder: new port 'system:capture_2'
Mon Feb 9 11:46:38 2015: graph reorder: new port 'system:playback_1'
Mon Feb 9 11:46:38 2015: graph reorder: new port 'system:playback_2'
Mon Feb 9 11:46:39 2015: Saving settings to "/home/xtian/.config/jack/conf.xml" ...
11:46:40.903 JACK connection change.
11:46:40.905 Server configuration saved to "/home/xtian/.jackdrc".
11:46:40.906 Statistics reset.
11:46:40.917 Client activated.
11:46:40.923 JACK connection graph change.
Mon Feb 9 11:46:40 2015: New client 'qjackctl' with PID 6837