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diff --git a/libs/ardour/ardour/control_group.h b/libs/ardour/ardour/control_group.h
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+/*
+  Copyright (C) 2016 Paul Davis
+
+  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 __libardour_control_group_h__
+#define __libardour_control_group_h__
+
+#include <map>
+#include <vector>
+
+#include <boost/shared_ptr.hpp>
+#include <boost/enable_shared_from_this.hpp>
+
+#include <glibmm/threads.h>
+
+#include "pbd/controllable.h"
+
+#include "evoral/Parameter.hpp"
+
+#include "ardour/automation_control.h"
+#include "ardour/types.h"
+
+namespace ARDOUR {
+
+class LIBARDOUR_API ControlGroup : public boost::enable_shared_from_this<ControlGroup>
+{
+  public:
+	ControlGroup (Evoral::Parameter p);
+	virtual ~ControlGroup ();
+
+	enum Mode {
+		Relative = 0x1,
+		Inverted = 0x2,
+	};
+
+	int add_control (boost::shared_ptr<AutomationControl>);
+	int remove_control (boost::shared_ptr<AutomationControl>);
+
+	ControlList controls () const;
+
+	void clear ();
+
+	void set_active (bool);
+	bool active() const { return _active; }
+
+	void set_mode (Mode m);
+	Mode mode () const { return _mode; }
+
+	Evoral::Parameter parameter() const { return _parameter; }
+
+	virtual void set_group_value (boost::shared_ptr<AutomationControl>, double val);
+
+	bool use_me (PBD::Controllable::GroupControlDisposition gcd) const {
+		switch (gcd) {
+		case PBD::Controllable::ForGroup:
+			return false;
+		case PBD::Controllable::NoGroup:
+			return false;
+		case PBD::Controllable::InverseGroup:
+			return !_active;
+		default:
+			return _active;
+		}
+	}
+
+  protected:
+	typedef std::map<PBD::ID,boost::shared_ptr<AutomationControl> > ControlMap;
+	Evoral::Parameter _parameter;
+	mutable Glib::Threads::RWLock controls_lock;
+	ControlMap _controls;
+	bool _active;
+	Mode _mode;
+	PBD::ScopedConnectionList member_connections;
+	bool propagating;
+
+	void control_going_away (boost::weak_ptr<AutomationControl>);
+};
+
+
+class LIBARDOUR_API GainControlGroup : public ControlGroup
+{
+  public:
+	GainControlGroup();
+
+	void set_group_value (boost::shared_ptr<AutomationControl>, double val);
+
+  private:
+	gain_t get_max_factor (gain_t);
+	gain_t get_min_factor (gain_t);
+};
+
+} /* namespace */
+
+#endif /* __libardour_control_group_h__ */