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diff --git a/src/sound/MappedCommon.h b/src/sound/MappedCommon.h
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+++ b/src/sound/MappedCommon.h
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+// -*- c-indentation-style:"stroustrup" c-basic-offset: 4 -*-
+
+/*
+  Rosegarden
+  A sequencer and musical notation editor.
+
+  This program is Copyright 2000-2008
+  Guillaume Laurent   <glaurent@telegraph-road.org>,
+  Chris Cannam        <cannam@all-day-breakfast.com>,
+  Richard Bown        <bownie@bownie.com>
+
+  The moral right of the authors to claim authorship of this work
+  has been asserted.
+
+  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.  See the file
+  COPYING included with this distribution for more information.
+*/
+
+#ifndef _MAPPEDCOMMON_H_
+#define _MAPPEDCOMMON_H_
+
+// Some Mapped types that gui and sound libraries use to communicate
+// plugin and Studio information.  Putting them here so we can change
+// MappedStudio regularly without having to rebuild the gui.
+//
+#include <vector>
+
+#include <qstring.h>
+#include <qdatastream.h>
+
+namespace Rosegarden
+{
+
+typedef int          MappedObjectId;
+typedef QString      MappedObjectProperty;
+typedef float        MappedObjectValue;
+
+// typedef QValueVector<MappedObjectProperty> MappedObjectPropertyList;
+// replaced with a std::vector<> for Qt2 compatibility
+
+typedef std::vector<MappedObjectId> MappedObjectIdList;
+typedef std::vector<MappedObjectProperty> MappedObjectPropertyList;
+typedef std::vector<MappedObjectValue> MappedObjectValueList;
+
+// The direction in which a port operates.
+//
+typedef enum
+{
+    ReadOnly,  // input port
+    WriteOnly, // output port
+    Duplex
+} PortDirection;
+
+QDataStream& operator>>(QDataStream& s, MappedObjectIdList&);
+QDataStream& operator<<(QDataStream&, const MappedObjectIdList&);
+
+QDataStream& operator>>(QDataStream& s, MappedObjectPropertyList&);
+QDataStream& operator<<(QDataStream&, const MappedObjectPropertyList&);
+
+QDataStream& operator>>(QDataStream& s, MappedObjectValueList&);
+QDataStream& operator<<(QDataStream&, const MappedObjectValueList&);
+
+}
+
+#endif // _MAPPEDCOMMON_H_