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/usr/bin/ecarack is in jack-rack 1.4.8~rc1-2ubuntu2.

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The actual contents of the file can be viewed below.

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#!/usr/bin/python
# ecarack: use ecasound to run a saved JACK Rack configuration.
# This is rather simplistic: it only looks at plugin controls and the Enable
# buttons, so MIDI controls, wet/dry settings and the like will be ignored.
# Copyright (C) 2007 Adam Sampson <ats@offog.org>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

import sys, os, gzip, xml.dom.minidom

def main(args):
	if len(args) != 1 or args[0] == "--help":
		print >>sys.stderr, "Usage: ecarack RACK-FILE"
		return 1

	try:
		f = gzip.open(args[0], "r")
	except IOError, e:
		print >>sys.stderr, "Failed to open %s: %s" % (args[0], e)
		return 1
	try:
		dom = xml.dom.minidom.parse(f)
	except:
		print >>sys.stderr, "Failed to parse %s" % args[0]
		return 1
	f.close()

	cmd = ["ecasound", "-i:jack_auto", "-o:jack_auto"]

	def get(node, tag):
		return node.getElementsByTagName(tag)
	def text(node):
		if node.nodeType == node.TEXT_NODE:
			return node.data
		else:
			return " ".join(map(text, node.childNodes)).strip()
	for plugin in get(dom, "plugin"):
		if text(get(plugin, "enabled")[0]) == "false":
			continue
		id = text(get(plugin, "id")[0])
		controls = [text(get(n, "value")[0])
		            for n in get(plugin, "controlrow")]
		cmd.append("-eli:" + id + "".join(["," + v for v in controls]))

	print >>sys.stderr, "ecarack: running " + " ".join(cmd)
	os.execvp(cmd[0], cmd)
	return 1

if __name__ == "__main__":
	sys.exit(main(sys.argv[1:]))