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diff --git a/src/commands/edit/InvertCommand.cpp b/src/commands/edit/InvertCommand.cpp
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+++ b/src/commands/edit/InvertCommand.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 "InvertCommand.h"
+
+#include "base/NotationTypes.h"
+#include "base/Selection.h"
+#include "document/BasicSelectionCommand.h"
+#include <qstring.h>
+#include "base/BaseProperties.h"
+
+
+namespace Rosegarden
+{
+
+using namespace BaseProperties;
+
+void
+InvertCommand::modifySegment()
+{
+    EventSelection::eventcontainer::iterator i;
+    long highestPitch, lowestPitch;
+
+    bool firstNote = true;
+    for (i = m_selection->getSegmentEvents().begin();
+            i != m_selection->getSegmentEvents().end(); ++i) {
+
+        if ((*i)->isa(Note::EventType)) {
+            try {
+                long pitch = (*i)->get
+                             <Int>(PITCH);
+                if (firstNote) {
+                    highestPitch = pitch;
+                    lowestPitch = pitch;
+                    firstNote = false;
+                } else {
+                    if (pitch > highestPitch)
+                        highestPitch = pitch;
+                    else if (pitch < lowestPitch)
+                        lowestPitch = pitch;
+                }
+            } catch (...) { }
+        }
+    }
+
+    for (i = m_selection->getSegmentEvents().begin();
+            i != m_selection->getSegmentEvents().end(); ++i) {
+
+        if ((*i)->isa(Note::EventType)) {
+            try {
+                long pitch = (*i)->get
+                             <Int>(PITCH);
+                pitch = lowestPitch + (highestPitch - pitch);
+                pitch += m_semitones;
+                (*i)->set
+                <Int>(PITCH, pitch);
+                (*i)->unset(ACCIDENTAL);
+            } catch (...) { }
+        }
+    }
+}
+
+}