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diff --git a/src/sound/MappedInstrument.h b/src/sound/MappedInstrument.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   <[email protected]>,
+  Chris Cannam        <[email protected]>,
+  Richard Bown        <[email protected]>
+
+  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.
+*/
+
+#include "Instrument.h"
+#include "MappedDevice.h"
+#include "MappedCommon.h"
+
+#ifndef _MAPPEDINSTRUMENT_H_
+#define _MAPPEDINSTRUMENT_H_
+
+// A scaled-down version of an Instrument that we keep Sequencer
+// side.  IDs match with those on the GUI.
+//
+//
+
+namespace Rosegarden
+{
+
+class MappedInstrument
+{
+public:
+
+    MappedInstrument();
+
+    // GUI uses this constructor because it already knows
+    // the name of the Instrument
+    //
+    MappedInstrument(Instrument::InstrumentType type,
+                     MidiByte channel,
+                     InstrumentId id);
+
+    // Driver uses this constructor (because the gui will want
+    // to know the name)
+    //
+    MappedInstrument(Instrument::InstrumentType type,
+                     MidiByte channel,
+                     InstrumentId id,
+                     const std::string &name,
+                     DeviceId device);
+
+    // from instrument
+    MappedInstrument(const Instrument &instrument);
+    MappedInstrument(Instrument *instrument);
+
+    ~MappedInstrument() { ;}
+
+    void setId(InstrumentId id) { m_id = id; }
+    InstrumentId getId() const { return m_id; }
+
+    void setChannel(MidiByte channel) { m_channel = channel; }
+    MidiByte getChannel() const { return m_channel; }
+
+    void setType(Instrument::InstrumentType type) { m_type = type; }
+    Instrument::InstrumentType getType() const { return m_type; }
+
+    void setName(const std::string &name) { m_name = name; }
+    const std::string& getName() const { return m_name; }
+
+    void setDevice(DeviceId device) { m_device = device; }
+    DeviceId getDevice() const { return m_device; }
+
+    // How many audio channels we've got on this audio MappedInstrument
+    //
+    unsigned int getAudioChannels() const { return m_audioChannels; }
+    void setAudioChannels(unsigned int channels) { m_audioChannels = channels; }
+
+    friend QDataStream& operator>>(QDataStream &dS, MappedInstrument *mI);
+    friend QDataStream& operator<<(QDataStream &dS, MappedInstrument *mI);
+    friend QDataStream& operator>>(QDataStream &dS, MappedInstrument &mI);
+    friend QDataStream& operator<<(QDataStream &dS, const MappedInstrument &mI);
+
+private:
+
+    Instrument::InstrumentType  m_type;
+    MidiByte                    m_channel;
+    InstrumentId                m_id;
+    std::string                 m_name;
+    DeviceId                    m_device;
+
+    // If this is an audio MappedInstrument then how many channels
+    // are associated with it?
+    //
+    unsigned int                m_audioChannels;
+};
+
+}
+
+#endif // _MAPPEDINSTRUMENT_H_