(jack-rack:28992): Gtk-WARNING **: cannot open display:

JACK Rack version 1.4.8rc1 Copyright (C) 2002, 2003 Robert Ham <node@users.sourceforge.net> Copyright (C) 2005, 2006 Leslie P. Polzer <leslie.polzer@gmx.net> Copyright (C) 2006, 2007 Adam Sampson <ats@offog.org> This program comes with ABSOLUTELY NO WARRANTY. You are licensed to use it under the terms of the GNU General Public License, version 2 or later. See the COPYING file that came with this software for details. Compiled with: JACK 0.124.1 ALSA 1.0.29 libxml2 2.9.2 Usage: jack-rack [OPTION]... [file] -h, --help Display this help info -p, --pid-name Use the pid in the JACK client name (default) -s, --string-name <string> Use <string> in the JACK client name -n, --name Use just jack_rack as the client name -i, --input Connected inputs to the first two physical capture ports -o, --output Connected outputs to the first two physical playback ports -c, --channels <int> How many input and output channels the rack should use (default: 2)