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diff --git a/libs/surfaces/cc121/gui.h b/libs/surfaces/cc121/gui.h
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+/*
+    Copyright (C) 2015 Paul Davis
+    Copyright (C) 2016 W.P. van Paassen
+
+    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.
+
+*/
+
+#ifndef __ardour_cc121_gui_h__
+#define __ardour_cc121_gui_h__
+
+#include <vector>
+#include <string>
+
+#include <gtkmm/box.h>
+#include <gtkmm/combobox.h>
+#include <gtkmm/image.h>
+#include <gtkmm/table.h>
+#include <gtkmm/treestore.h>
+
+namespace Gtk {
+	class CellRendererCombo;
+	class ListStore;
+}
+
+#include "cc121.h"
+
+namespace ArdourSurface {
+
+class CC121GUI : public Gtk::VBox
+{
+public:
+	CC121GUI (CC121&);
+	~CC121GUI ();
+
+private:
+	CC121& fp;
+	Gtk::HBox hpacker;
+	Gtk::Table table;
+	Gtk::Table action_table;
+	Gtk::ComboBox input_combo;
+	Gtk::ComboBox output_combo;
+	Gtk::Image    image;
+
+	Gtk::ComboBox foot_combo;
+	Gtk::ComboBox function1_combo;
+	Gtk::ComboBox function2_combo;
+	Gtk::ComboBox function3_combo;
+	Gtk::ComboBox function4_combo;
+	Gtk::ComboBox value_combo;
+	Gtk::ComboBox lock_combo;
+	Gtk::ComboBox eq1_combo;
+	Gtk::ComboBox eq2_combo;
+	Gtk::ComboBox eq3_combo;
+	Gtk::ComboBox eq4_combo;
+	Gtk::ComboBox eqtype_combo;
+	Gtk::ComboBox allbypass_combo;
+
+	void update_port_combos ();
+	PBD::ScopedConnection connection_change_connection;
+	void connection_handler ();
+
+	struct MidiPortColumns : public Gtk::TreeModel::ColumnRecord {
+		MidiPortColumns() {
+			add (short_name);
+			add (full_name);
+		}
+		Gtk::TreeModelColumn<std::string> short_name;
+		Gtk::TreeModelColumn<std::string> full_name;
+	};
+
+	MidiPortColumns midi_port_columns;
+	bool ignore_active_change;
+
+	Glib::RefPtr<Gtk::ListStore> build_midi_port_list (std::vector<std::string> const & ports, bool for_input);
+	void active_port_changed (Gtk::ComboBox*,bool for_input);
+
+	struct ActionColumns : public Gtk::TreeModel::ColumnRecord {
+		ActionColumns() {
+			add (name);
+			add (path);
+		}
+		Gtk::TreeModelColumn<std::string> name;
+		Gtk::TreeModelColumn<std::string> path;
+	};
+
+	ActionColumns action_columns;
+	Glib::RefPtr<Gtk::TreeStore> available_action_model;
+	std::map<std::string,std::string> action_map; // map from action names to paths
+
+	void build_action_combo (Gtk::ComboBox& cb, std::vector<std::pair<std::string,std::string> > const & actions, CC121::ButtonID, CC121::ButtonState);
+	void build_user_action_combo (Gtk::ComboBox&, CC121::ButtonState, CC121::ButtonID);
+	void build_foot_action_combo (Gtk::ComboBox&, CC121::ButtonState);
+
+	void build_available_action_menu ();
+	void action_changed (Gtk::ComboBox*, CC121::ButtonID, CC121::ButtonState);
+
+	bool find_action_in_model (const Gtk::TreeModel::iterator& iter, std::string const & action_path, Gtk::TreeModel::iterator* found);
+
+};
+
+}
+
+#endif /* __ardour_cc121_gui_h__ */