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diff --git a/src/commands/edit/SelectionPropertyCommand.cpp b/src/commands/edit/SelectionPropertyCommand.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   <glaurent@telegraph-road.org>,
+        Chris Cannam        <cannam@all-day-breakfast.com>,
+        Richard Bown        <richard.bown@ferventsoftware.com>
+ 
+    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 "SelectionPropertyCommand.h"
+
+#include "base/Event.h"
+#include "base/PropertyName.h"
+#include "base/Selection.h"
+#include "document/BasicSelectionCommand.h"
+#include <qstring.h>
+
+
+namespace Rosegarden
+{
+
+SelectionPropertyCommand::SelectionPropertyCommand(
+    EventSelection *selection,
+    const PropertyName &property,
+    PropertyPattern pattern,
+    int value1,
+    int value2):
+        BasicSelectionCommand(getGlobalName(), *selection, true),
+        m_selection(selection),
+        m_property(property),
+        m_pattern(pattern),
+        m_value1(value1),
+        m_value2(value2)
+{}
+
+void
+SelectionPropertyCommand::modifySegment()
+{
+    EventSelection::eventcontainer::iterator i =
+        m_selection->getSegmentEvents().begin();
+
+    int count = 0;
+
+    timeT endTime = 0;
+    timeT startTime = 0;
+    bool haveStart = false, haveEnd = false;
+
+    // Get start and end times
+    //
+    for (;i != m_selection->getSegmentEvents().end(); ++i) {
+        if ((*i)->getAbsoluteTime() < startTime || !haveStart) {
+            startTime = (*i)->getAbsoluteTime();
+            haveStart = true;
+        }
+
+        if ((*i)->getAbsoluteTime() > endTime || !haveEnd) {
+            endTime = (*i)->getAbsoluteTime();
+            haveEnd = true;
+        }
+    }
+
+    double step = double(m_value1 - m_value2) / double(endTime - startTime);
+    double lowStep = double(m_value2) / double(endTime - startTime);
+
+    for (i = m_selection->getSegmentEvents().begin();
+            i != m_selection->getSegmentEvents().end(); ++i) {
+        // flat
+        if (m_pattern == FlatPattern)
+            (*i)->set
+            <Int>(m_property, m_value1);
+        else if (m_pattern == AlternatingPattern) {
+            if (count % 2 == 0)
+                (*i)->set
+                <Int>(m_property, m_value1);
+            else
+                (*i)->set
+                <Int>(m_property, m_value2);
+
+            // crescendo, decrescendo
+            // (determined by step, above, which is in turn influenced by whether
+            // value1 is greater than value2)
+        } else if ((m_pattern == CrescendoPattern) ||
+                   (m_pattern == DecrescendoPattern)) {
+            (*i)->set
+            <Int>(m_property,
+                  m_value1 -
+                  int(step *
+                      ((*i)->getAbsoluteTime() - startTime)));
+            // ringing
+        } else if (m_pattern == RingingPattern) {
+            if (count % 2 == 0)
+                (*i)->set
+                <Int>
+                (m_property,
+                 m_value1 - int(step *
+                                ((*i)->getAbsoluteTime() - startTime)));
+            else {
+                int value = m_value2 - int(lowStep *
+                                           ((*i)->getAbsoluteTime() - startTime));
+                if (value < 0)
+                    value = 0;
+
+                (*i)->set
+                <Int>(m_property, value);
+            }
+        }
+
+        count++;
+    }
+}
+
+}