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diff --git a/libs/panners/stereobalance/panner_balance.h b/libs/panners/stereobalance/panner_balance.h
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+++ b/libs/panners/stereobalance/panner_balance.h
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+/*
+    Copyright (C) 2004-2014 Paul Davis
+    adopted from 2in2out panner by 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+*/
+
+#ifndef __ardour_panner_balance_h__
+#define __ardour_panner_balance_h__
+
+#include <cmath>
+#include <cassert>
+#include <vector>
+#include <string>
+#include <iostream>
+
+#include "pbd/stateful.h"
+#include "pbd/controllable.h"
+#include "pbd/cartesian.h"
+
+#include "ardour/automation_control.h"
+#include "ardour/automatable.h"
+#include "ardour/panner.h"
+#include "ardour/types.h"
+
+namespace ARDOUR {
+
+class Pannerbalance : public Panner
+{
+	public:
+	Pannerbalance (boost::shared_ptr<Pannable>);
+	~Pannerbalance ();
+
+	ChanCount in() const { return ChanCount (DataType::AUDIO, 2); }
+	ChanCount out() const { return ChanCount (DataType::AUDIO, 2); }
+
+	void set_position (double);
+	bool clamp_position (double&);
+	std::pair<double, double> position_range () const;
+	double position () const;
+
+	std::set<Evoral::Parameter> what_can_be_automated() const;
+
+	static Panner* factory (boost::shared_ptr<Pannable>, boost::shared_ptr<Speakers>);
+
+	std::string describe_parameter (Evoral::Parameter);
+	std::string value_as_string (boost::shared_ptr<AutomationControl>) const;
+
+	XMLNode& get_state ();
+
+	void reset ();
+	void thaw ();
+
+	protected:
+	float pos[2];
+	float desired_pos[2];
+	float pos_interp[2];
+
+	void update ();
+
+	private:
+	void distribute_one (AudioBuffer& srcbuf, BufferSet& obufs, gain_t gain_coeff, pframes_t nframes, uint32_t which);
+	void distribute_one_automated (AudioBuffer& srcbuf, BufferSet& obufs,
+			framepos_t start, framepos_t end, pframes_t nframes,
+			pan_t** buffers, uint32_t which);
+};
+
+} // namespace
+
+#endif /* __ardour_panner_balance_h__ */