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diff --git a/plugins/ZamHeadX2/ZamHeadX2UI.hpp b/plugins/ZamHeadX2/ZamHeadX2UI.hpp
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+++ b/plugins/ZamHeadX2/ZamHeadX2UI.hpp
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+/*
+ * ZamHeadX2 stereo HRTF tool
+ * Copyright (C) 2014  Damien Zammit <damien@zamaudio.com>
+ *
+ * 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 any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * For a full copy of the GNU General Public License see the doc/GPL.txt file.
+ */
+
+#ifndef ZAMCOMPX2UI_HPP_INCLUDED
+#define ZAMCOMPX2UI_HPP_INCLUDED
+
+#include "DistrhoUI.hpp"
+
+#include "ImageKnob.hpp"
+#include "ZamHeadX2Artwork.hpp"
+
+using DGL::Image;
+using DGL::ImageKnob;
+
+START_NAMESPACE_DISTRHO
+
+// -----------------------------------------------------------------------
+
+class ZamHeadX2UI : public UI,
+                    public ImageKnob::Callback
+{
+public:
+    ZamHeadX2UI();
+
+protected:
+    // -------------------------------------------------------------------
+    // DSP Callbacks
+
+    void parameterChanged(uint32_t index, float value) override;
+    void programLoaded(uint32_t index) override;
+
+    // -------------------------------------------------------------------
+    // Widget Callbacks
+
+    void imageKnobDragStarted(ImageKnob* knob) override;
+    void imageKnobDragFinished(ImageKnob* knob) override;
+    void imageKnobValueChanged(ImageKnob* knob, float value) override;
+
+    void onDisplay() override;
+
+private:
+    Image fImgBackground;
+    ScopedPointer<ImageKnob> fKnobAzimuth, fKnobElevation;
+};
+
+// -----------------------------------------------------------------------
+
+END_NAMESPACE_DISTRHO
+
+#endif // ZAMCOMPX2UI_HPP_INCLUDED