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diff --git a/src/gui/seqmanager/CompositionMmapper.cpp b/src/gui/seqmanager/CompositionMmapper.cpp
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+++ b/src/gui/seqmanager/CompositionMmapper.cpp
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+/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */
+
+/*
+    Rosegarden
+    A MIDI and audio 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 rights of Guillaume Laurent, Chris Cannam, and Richard
+    Bown to claim authorship of this work have been asserted.
+ 
+    Other copyrights also apply to some parts of this work.  Please
+    see the AUTHORS file and individual file headers for details.
+ 
+    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 "CompositionMmapper.h"
+#include "misc/Debug.h"
+
+#include <kstddirs.h>
+#include "base/Composition.h"
+#include "base/Segment.h"
+#include "document/RosegardenGUIDoc.h"
+#include "gui/application/RosegardenApplication.h"
+#include "SegmentMmapperFactory.h"
+#include "SegmentMmapper.h"
+#include <kglobal.h>
+#include <qdir.h>
+#include <qfile.h>
+#include <qstring.h>
+#include <qstringlist.h>
+#include <stdint.h>
+
+
+namespace Rosegarden
+{
+
+CompositionMmapper::CompositionMmapper(RosegardenGUIDoc *doc)
+        : m_doc(doc)
+{
+    cleanup();
+
+    SEQMAN_DEBUG << "CompositionMmapper() - doc = " << doc << endl;
+    Composition &comp = m_doc->getComposition();
+
+    for (Composition::iterator it = comp.begin(); it != comp.end(); it++) {
+
+        Track* track = comp.getTrackById((*it)->getTrack());
+
+        // check to see if track actually exists
+        //
+        if (track == 0)
+            continue;
+
+        mmapSegment(*it);
+    }
+}
+
+CompositionMmapper::~CompositionMmapper()
+{
+    SEQMAN_DEBUG << "~CompositionMmapper()\n";
+
+    //
+    // Clean up possible left-overs
+    //
+    cleanup();
+
+    for (segmentmmapers::iterator i = m_segmentMmappers.begin();
+            i != m_segmentMmappers.end(); ++i)
+        delete i->second;
+}
+
+void CompositionMmapper::cleanup()
+{
+    // In case the sequencer is still running, mapping some segments
+    //
+    rgapp->sequencerSend("closeAllSegments()");
+
+    // Erase all 'segment_*' files
+    //
+    QString tmpPath = KGlobal::dirs()->resourceDirs("tmp").last();
+
+    QDir segmentsDir(tmpPath, "segment_*");
+    for (unsigned int i = 0; i < segmentsDir.count(); ++i) {
+        QString segmentName = tmpPath + '/' + segmentsDir[i];
+        SEQMAN_DEBUG << "CompositionMmapper : cleaning up " << segmentName << endl;
+        QFile::remove
+            (segmentName);
+    }
+
+}
+
+bool CompositionMmapper::segmentModified(Segment* segment)
+{
+    SegmentMmapper* mmapper = m_segmentMmappers[segment];
+
+    if (!mmapper)
+        return false; // this can happen with the SegmentSplitCommand, where the new segment's transpose is set
+    // even though it's not mapped yet
+
+    SEQMAN_DEBUG << "CompositionMmapper::segmentModified(" << segment << ") - mmapper = "
+    << mmapper << endl;
+
+    return mmapper->refresh();
+}
+
+void CompositionMmapper::segmentAdded(Segment* segment)
+{
+    SEQMAN_DEBUG << "CompositionMmapper::segmentAdded(" << segment << ")\n";
+
+    mmapSegment(segment);
+}
+
+void CompositionMmapper::segmentDeleted(Segment* segment)
+{
+    SEQMAN_DEBUG << "CompositionMmapper::segmentDeleted(" << segment << ")\n";
+    SegmentMmapper* mmapper = m_segmentMmappers[segment];
+    m_segmentMmappers.erase(segment);
+    SEQMAN_DEBUG << "CompositionMmapper::segmentDeleted() : deleting SegmentMmapper " << mmapper << endl;
+
+    delete mmapper;
+}
+
+void CompositionMmapper::mmapSegment(Segment* segment)
+{
+    SEQMAN_DEBUG << "CompositionMmapper::mmapSegment(" << segment << ")\n";
+
+    SegmentMmapper* mmapper = SegmentMmapperFactory::makeMmapperForSegment(m_doc,
+                              segment,
+                              makeFileName(segment));
+
+    if (mmapper)
+        m_segmentMmappers[segment] = mmapper;
+}
+
+QString CompositionMmapper::makeFileName(Segment* segment)
+{
+    QStringList tmpDirs = KGlobal::dirs()->resourceDirs("tmp");
+
+    return QString("%1/segment_%2")
+           .arg(tmpDirs.last())
+           .arg((uintptr_t)segment, 0, 16);
+}
+
+QString CompositionMmapper::getSegmentFileName(Segment* s)
+{
+    SegmentMmapper* mmapper = m_segmentMmappers[s];
+
+    if (mmapper)
+        return mmapper->getFileName();
+    else
+        return QString::null;
+}
+
+size_t CompositionMmapper::getSegmentFileSize(Segment* s)
+{
+    SegmentMmapper* mmapper = m_segmentMmappers[s];
+    
+    if (mmapper)
+        return mmapper->getFileSize();
+    else
+        return 0;
+}
+
+}