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diff --git a/attic/muse_qt4_evolution/synti/libsynti/gui.h b/attic/muse_qt4_evolution/synti/libsynti/gui.h
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index 00000000..27bebe3f
--- /dev/null
+++ b/attic/muse_qt4_evolution/synti/libsynti/gui.h
@@ -0,0 +1,72 @@
+//=========================================================
+//  MusE
+//  Linux Music Editor
+//    software synthesizer helper library
+//    $Id: gui.h,v 1.5 2005/05/11 14:18:48 wschweer Exp $
+//
+//  (C) Copyright 2004 Werner Schweer (ws@seh.de)
+//=========================================================
+
+#ifndef __SYNTH_GUI_H__
+#define __SYNTH_GUI_H__
+
+#include "midievent.h"
+
+const int EVENT_FIFO_SIZE = 256;
+class QWidget;
+
+//---------------------------------------------------------
+//   MessGui
+//    manage IO from synti-GUI to Host
+//---------------------------------------------------------
+
+class MessGui {
+      int writeFd;
+
+      // Event Fifo  synti -> GUI
+      MidiEvent rFifo[EVENT_FIFO_SIZE];
+      volatile int rFifoSize;
+      int rFifoWindex;
+      int rFifoRindex;
+
+      // Event Fifo  GUI -> synti
+      MidiEvent wFifo[EVENT_FIFO_SIZE];
+      volatile int wFifoSize;
+      int wFifoWindex;
+      int wFifoRindex;
+
+   protected:
+      int readFd;
+      void readMessage();
+      void sendEvent(const MidiEvent& ev);
+      void sendController(int ch, int idx, int val);
+      void sendSysex(unsigned char*, int);
+
+      virtual void processEvent(const MidiEvent&) {};
+
+   public:
+      MessGui();
+      virtual ~MessGui();
+
+      void writeEvent(const MidiEvent&);
+      int fifoSize() const { return wFifoSize; }
+      MidiEvent readEvent();
+      };
+
+//---------------------------------------------------------
+//   SynthGuiCtrl
+//---------------------------------------------------------
+
+struct SynthGuiCtrl  {
+      enum EditorType { SLIDER, SWITCH, COMBOBOX };
+      QWidget* editor;
+      QWidget* label;
+      EditorType type;
+
+      SynthGuiCtrl() {}
+      SynthGuiCtrl(QWidget* w, QWidget* l, const EditorType t)
+         : editor(w), label(l), type(t) {}
+      };
+
+#endif
+