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diff --git a/libs/evoral/evoral/Control.h b/libs/evoral/evoral/Control.h
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+/*
+ * Copyright (C) 2008-2014 David Robillard <d@drobilla.net>
+ * Copyright (C) 2010-2012 Carl Hetherington <carl@carlh.net>
+ * Copyright (C) 2010-2013 Paul Davis <paul@linuxaudiosystems.com>
+ *
+ * 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_CONTROL_HPP
+#define EVORAL_CONTROL_HPP
+
+#include <set>
+#include <map>
+#include <boost/shared_ptr.hpp>
+#include "pbd/signals.h"
+
+#include "evoral/visibility.h"
+#include "evoral/Parameter.h"
+#include "evoral/ParameterDescriptor.h"
+
+namespace Evoral {
+
+class ControlList;
+class ParameterDescriptor;
+class Transport;
+class TypeMap;
+
+/** Base class representing some kind of (automatable) control; a fader's gain,
+ *  for example, or a compressor plugin's threshold.
+ *
+ *  The class knows the Evoral::Parameter that it is controlling, and has
+ *  a list of values for automation.
+ */
+class LIBEVORAL_API Control
+{
+public:
+	Control(const Parameter&               parameter,
+	        const ParameterDescriptor&     desc,
+	        boost::shared_ptr<ControlList> list);
+
+	virtual ~Control() {}
+
+	virtual void   set_double (double val, double frame=0, bool to_list=false);
+	virtual double get_double (bool from_list=false, double frame=0) const;
+
+	/** Get the latest user-set value
+	 * (which may not equal get_value() when automation is playing back).
+	 *
+	 * Automation write/touch works by periodically sampling this value
+	 * and adding it to the ControlList.
+	 */
+	double user_double() const { return _user_value; }
+
+	void set_list(boost::shared_ptr<ControlList>);
+
+	boost::shared_ptr<ControlList>       list()       { return _list; }
+	boost::shared_ptr<const ControlList> list() const { return _list; }
+
+	inline const Parameter& parameter() const { return _parameter; }
+
+	/** Emitted when the our ControlList is marked dirty */
+	PBD::Signal0<void> ListMarkedDirty;
+
+protected:
+	Parameter                      _parameter;
+	boost::shared_ptr<ControlList> _list;
+	double                         _user_value;
+	PBD::ScopedConnection          _list_marked_dirty_connection;
+
+private:
+	void list_marked_dirty ();
+};
+
+} // namespace Evoral
+
+#endif // EVORAL_CONTROL_HPP