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diff --git a/src/commands/segment/SegmentChangeQuantizationCommand.cpp b/src/commands/segment/SegmentChangeQuantizationCommand.cpp
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+++ b/src/commands/segment/SegmentChangeQuantizationCommand.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 "SegmentChangeQuantizationCommand.h"
+
+#include "base/Segment.h"
+#include "base/BasicQuantizer.h"
+#include "gui/editors/notation/NotationStrings.h"
+#include <qstring.h>
+
+
+namespace Rosegarden
+{
+
+SegmentChangeQuantizationCommand::SegmentChangeQuantizationCommand(timeT unit) :
+        KNamedCommand(getGlobalName(unit)),
+        m_unit(unit)
+{
+    // nothing
+}
+
+SegmentChangeQuantizationCommand::~SegmentChangeQuantizationCommand()
+{
+    // nothing
+}
+
+void
+SegmentChangeQuantizationCommand::execute()
+{
+    for (unsigned int i = 0; i < m_records.size(); ++i) {
+
+        SegmentRec &rec = m_records[i];
+
+        if (m_unit) {
+
+            rec.oldUnit = rec.segment->getQuantizer()->getUnit();
+            rec.segment->setQuantizeLevel(m_unit);
+
+            rec.wasQuantized = rec.segment->hasQuantization();
+            rec.segment->setQuantization(true);
+
+        } else {
+
+            rec.wasQuantized = rec.segment->hasQuantization();
+            rec.segment->setQuantization(false);
+        }
+    }
+}
+
+void
+SegmentChangeQuantizationCommand::unexecute()
+{
+    for (unsigned int i = 0; i < m_records.size(); ++i) {
+
+        SegmentRec &rec = m_records[i];
+
+        if (m_unit) {
+
+            if (!rec.wasQuantized)
+                rec.segment->setQuantization(false);
+            rec.segment->setQuantizeLevel(rec.oldUnit);
+
+        } else {
+
+            if (rec.wasQuantized)
+                rec.segment->setQuantization(true);
+        }
+    }
+}
+
+void
+SegmentChangeQuantizationCommand::addSegment(Segment *s)
+{
+    SegmentRec rec;
+    rec.segment = s;
+    rec.oldUnit = 0; // shouldn't matter what we initialise this to
+    rec.wasQuantized = false; // shouldn't matter what we initialise this to
+    m_records.push_back(rec);
+}
+
+QString
+SegmentChangeQuantizationCommand::getGlobalName(timeT unit)
+{
+    if (!unit) {
+        return "Unquantize";
+    } else {
+        timeT error = 0;
+        QString label = NotationStrings::makeNoteMenuLabel(unit, true, error);
+        return QString("Quantize to %1").arg(label);
+    }
+}
+
+}