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diff --git a/muse_qt4_evolution/awl/volslider.h b/muse_qt4_evolution/awl/volslider.h
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+//=============================================================================
+// Awl
+// Audio Widget Library
+// $Id:$
+//
+// Copyright (C) 2002-2006 by Werner Schweer and others
+//
+// This program is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License version 2.
+//
+// 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 __AWLVOLSLIDER_H__
+#define __AWLVOLSLIDER_H__
+
+#include "slider.h"
+
+namespace Awl {
+
+//---------------------------------------------------------
+// VolSlider
+//! Volume Slider entry widget
+//
+//! This widget implements a slider with a logarithmic
+//! floating point scale used to adjust the volume
+//! in an audio mixer.
+//! Internal value represents gain as a logarythmic
+//! dB value.
+//---------------------------------------------------------
+
+class VolSlider : public Slider {
+ Q_OBJECT
+
+ protected:
+ virtual void mouseDoubleClickEvent(QMouseEvent*);
+
+ public slots:
+ virtual void setValue(double v);
+
+ public:
+ VolSlider(QWidget* parent = 0);
+
+ virtual double value() const;
+ };
+
+}
+
+#endif
+