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diff --git a/libs/evoral/evoral/ControlSet.h b/libs/evoral/evoral/ControlSet.h
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+/*
+ * Copyright (C) 2008-2015 David Robillard <d@drobilla.net>
+ * Copyright (C) 2010-2017 Paul Davis <paul@linuxaudiosystems.com>
+ * Copyright (C) 2010 Carl Hetherington <carl@carlh.net>
+ * Copyright (C) 2015 Robin Gareus <robin@gareus.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.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifndef EVORAL_CONTROLLABLE_HPP
+#define EVORAL_CONTROLLABLE_HPP
+
+#include <set>
+#include <map>
+#include <boost/shared_ptr.hpp>
+#include <boost/utility.hpp>
+#include <glibmm/threads.h>
+#include "pbd/signals.h"
+
+#include "evoral/visibility.h"
+#include "evoral/Parameter.h"
+#include "evoral/ControlList.h"
+
+namespace Evoral {
+
+class Control;
+class ControlEvent;
+
+class LIBEVORAL_API ControlSet : public boost::noncopyable {
+public:
+	ControlSet();
+	ControlSet (const ControlSet&);
+        virtual ~ControlSet() {}
+
+	virtual boost::shared_ptr<Evoral::Control> control_factory(const Evoral::Parameter& id) = 0;
+
+	boost::shared_ptr<Control>
+	control (const Parameter& id, bool create_if_missing=false);
+
+	inline boost::shared_ptr<const Control>
+	control (const Parameter& id) const {
+		const Controls::const_iterator i = _controls.find(id);
+		return (i != _controls.end() ? i->second : boost::shared_ptr<Control>());
+	}
+
+	typedef std::map< Parameter, boost::shared_ptr<Control> > Controls;
+	inline Controls&       controls()       { return _controls; }
+	inline const Controls& controls() const { return _controls; }
+
+	virtual void add_control(boost::shared_ptr<Control>);
+
+	virtual bool controls_empty() const { return _controls.size() == 0; }
+	virtual void clear_controls();
+
+	void what_has_data(std::set<Parameter>&) const;
+
+	Glib::Threads::Mutex& control_lock() const { return _control_lock; }
+
+protected:
+	virtual void control_list_marked_dirty () {}
+	virtual void control_list_interpolation_changed (Parameter, ControlList::InterpolationStyle) {}
+
+	mutable Glib::Threads::Mutex _control_lock;
+	Controls            _controls;
+
+	PBD::ScopedConnectionList _list_connections;
+
+private:
+
+	PBD::ScopedConnectionList _control_connections;
+};
+
+
+} // namespace Evoral
+
+#endif // EVORAL_CONTROLLABLE_HPP