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diff --git a/src/sound/ControlBlock.h b/src/sound/ControlBlock.h
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+// -*- 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.
+*/
+
+#ifndef _CONTROLBLOCK_H_
+#define _CONTROLBLOCK_H_
+
+#include "MidiProgram.h"
+#include "Track.h"
+
+namespace Rosegarden 
+{
+
+/**
+ * ONLY PUT PLAIN DATA HERE - NO POINTERS EVER
+ */
+struct TrackInfo 
+{
+    bool deleted;
+    bool muted;
+    bool armed;
+    char channelFilter;
+    DeviceId deviceFilter;
+    InstrumentId instrumentId;
+};
+
+#define CONTROLBLOCK_MAX_NB_TRACKS 1024 // can't be a symbol
+
+/**
+ * Sequencer control block, mmapped by the GUI
+ */
+class ControlBlock
+{
+public:
+    /// ctor for GUI
+    ControlBlock(unsigned int maxTrackId);
+
+    /// ctor for sequencer - all data is read from mmapped file
+    ControlBlock();
+
+    unsigned int getMaxTrackId() const { return m_maxTrackId; }
+    void updateTrackData(Track*);
+
+    void setInstrumentForTrack(TrackId trackId, InstrumentId);
+    InstrumentId getInstrumentForTrack(TrackId trackId) const;
+
+    void setTrackArmed(TrackId trackId, bool);
+    bool isTrackArmed(TrackId trackId) const;
+
+    void setTrackMuted(TrackId trackId, bool);
+    bool isTrackMuted(TrackId trackId) const;
+
+    void setTrackDeleted(TrackId trackId, bool);
+    bool isTrackDeleted(TrackId trackId) const;
+    
+    void setTrackChannelFilter(TrackId trackId, char);
+    char getTrackChannelFilter(TrackId trackId) const;
+    
+    void setTrackDeviceFilter(TrackId trackId, DeviceId);
+    DeviceId getTrackDeviceFilter(TrackId trackId) const;
+    
+    bool isInstrumentMuted(InstrumentId instrumentId) const;
+    bool isInstrumentUnused(InstrumentId instrumentId) const;
+
+    void setInstrumentForMetronome(InstrumentId instId) { m_metronomeInfo.instrumentId = instId; }
+    InstrumentId getInstrumentForMetronome() const      { return m_metronomeInfo.instrumentId; }
+
+    void setMetronomeMuted(bool mute) { m_metronomeInfo.muted = mute; }
+    bool isMetronomeMuted() const     { return m_metronomeInfo.muted; }
+
+    bool isSolo() const      { return m_solo; }
+    void setSolo(bool value) { m_solo = value; }
+    TrackId getSelectedTrack() const     { return m_selectedTrack; }
+    void setSelectedTrack(TrackId track) { m_selectedTrack = track; }
+
+    void setThruFilter(MidiFilter filter) { m_thruFilter = filter; }
+    MidiFilter getThruFilter() const { return m_thruFilter; }
+
+    void setRecordFilter(MidiFilter filter) { m_recordFilter = filter; }
+    MidiFilter getRecordFilter() const { return m_recordFilter; }
+    
+    void setMidiRoutingEnabled(bool enabled) { m_routing = enabled; }
+    bool isMidiRoutingEnabled() const { return m_routing; } 
+    
+    /**
+     * Gets an InstrumentId for the given DeviceId and Channel. If there
+     * is an armed track having a matching device and channel filters, 
+     * this method returns the instrument assigned to the track, even if 
+     * there are more tracks matching the same filters. If there is not a
+     * single match, it returns the instrument assigned to the selected
+     * track.
+     */
+    InstrumentId getInstrumentForEvent(unsigned int dev, 
+                                       unsigned int chan);
+
+protected:
+    //--------------- Data members ---------------------------------
+    // PUT ONLY PLAIN DATA HERE - NO POINTERS EVER
+    unsigned int m_maxTrackId;
+    bool m_solo;
+    bool m_routing;
+    MidiFilter m_thruFilter;
+    MidiFilter m_recordFilter;
+    TrackId m_selectedTrack;
+    TrackInfo m_metronomeInfo;
+    TrackInfo m_trackInfo[CONTROLBLOCK_MAX_NB_TRACKS]; // should be high enough for the moment
+};
+
+}
+
+#endif