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diff --git a/src/sound/LADSPAPluginInstance.h b/src/sound/LADSPAPluginInstance.h
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+++ b/src/sound/LADSPAPluginInstance.h
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+// -*- c-indentation-style:"stroustrup" c-basic-offset: 4 -*-
+
+/*
+    Rosegarden
+    A 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        <bownie@bownie.com>
+
+    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.
+*/
+
+#include <vector>
+#include <set>
+#include <qstring.h>
+#include "Instrument.h"
+
+#ifndef _LADSPAPLUGININSTANCE_H_
+#define _LADSPAPLUGININSTANCE_H_
+
+#ifdef HAVE_LADSPA
+
+#include <ladspa.h>
+#include "RunnablePluginInstance.h"
+
+namespace Rosegarden
+{
+
+// LADSPA plugin instance.  LADSPA is a variable block size API, but
+// for one reason and another it's more convenient to use a fixed
+// block size in this wrapper.
+//
+class LADSPAPluginInstance : public RunnablePluginInstance
+{
+public:
+    virtual ~LADSPAPluginInstance();
+
+    virtual bool isOK() const { return m_instanceHandles.size() != 0; }
+
+    InstrumentId getInstrument() const { return m_instrument; }
+    virtual QString getIdentifier() const { return m_identifier; }
+    int getPosition() const { return m_position; }
+
+    virtual void run(const RealTime &rt);
+
+    virtual void setPortValue(unsigned int portNumber, float value);
+    virtual float getPortValue(unsigned int portNumber);
+
+    virtual size_t getBufferSize() { return m_blockSize; }
+    virtual size_t getAudioInputCount() { return m_instanceCount * m_audioPortsIn.size(); }
+    virtual size_t getAudioOutputCount() { return m_instanceCount * m_audioPortsOut.size(); }
+    virtual sample_t **getAudioInputBuffers() { return m_inputBuffers; }
+    virtual sample_t **getAudioOutputBuffers() { return m_outputBuffers; }
+
+    virtual bool isBypassed() const { return m_bypassed; }
+    virtual void setBypassed(bool bypassed) { m_bypassed = bypassed; }
+
+    virtual size_t getLatency();
+
+    virtual void silence();
+    virtual void setIdealChannelCount(size_t channels); // may re-instantiate
+
+protected:
+    // To be constructed only by LADSPAPluginFactory
+    friend class LADSPAPluginFactory;
+
+    // Constructor that creates the buffers internally
+    // 
+    LADSPAPluginInstance(PluginFactory *factory,
+                         InstrumentId instrument,
+                         QString identifier,
+                         int position,
+                         unsigned long sampleRate,
+                         size_t blockSize,
+                         int idealChannelCount,
+                         const LADSPA_Descriptor* descriptor);
+
+    // Constructor that uses shared buffers
+    // 
+    LADSPAPluginInstance(PluginFactory *factory,
+                         InstrumentId instrument,
+                         QString identifier,
+                         int position,
+                         unsigned long sampleRate,
+                         size_t blockSize,
+                         sample_t **inputBuffers,
+                         sample_t **outputBuffers,
+                         const LADSPA_Descriptor* descriptor);
+
+    void init(int idealChannelCount = 0);
+    void instantiate(unsigned long sampleRate);
+    void cleanup();
+    void activate();
+    void deactivate();
+
+    // Connection of data (and behind the scenes control) ports
+    //
+    void connectPorts();
+    
+    InstrumentId   m_instrument;
+    int                        m_position;
+    std::vector<LADSPA_Handle> m_instanceHandles;
+    size_t                     m_instanceCount;
+    const LADSPA_Descriptor   *m_descriptor;
+
+    std::vector<std::pair<unsigned long, LADSPA_Data*> > m_controlPortsIn;
+    std::vector<std::pair<unsigned long, LADSPA_Data*> > m_controlPortsOut;
+
+    std::vector<int>          m_audioPortsIn;
+    std::vector<int>          m_audioPortsOut;
+
+    size_t                    m_blockSize;
+    sample_t                **m_inputBuffers;
+    sample_t                **m_outputBuffers;
+    bool                      m_ownBuffers;
+    size_t                    m_sampleRate;
+    float                    *m_latencyPort;
+    bool                      m_run;
+    
+    bool                      m_bypassed;
+};
+
+}
+
+#endif // HAVE_LADSPA
+
+#endif // _LADSPAPLUGININSTANCE_H_
+