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diff --git a/src/libs/engine/MidiNoteNode.hpp b/src/libs/engine/MidiNoteNode.hpp
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+/* This file is part of Ingen.
+ * Copyright (C) 2007 Dave Robillard <http://drobilla.net>
+ * 
+ * Ingen 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.
+ * 
+ * Ingen 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 details.
+ * 
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef MIDINOTENODE_H
+#define MIDINOTENODE_H
+
+#include <string>
+#include "InternalNode.hpp"
+#include "types.hpp"
+#include "MidiBuffer.hpp"
+
+using std::string;
+
+namespace Ingen {
+
+class InputPort;
+class OutputPort;
+
+
+/** MIDI note input node.
+ *
+ * For pitched instruments like keyboard, etc.
+ *
+ * \ingroup engine
+ */
+class MidiNoteNode : public InternalNode
+{
+public:
+	MidiNoteNode(const string& path, size_t poly, Patch* parent, SampleRate srate, size_t buffer_size);
+	~MidiNoteNode();
+
+	void process(SampleCount nframes, FrameTime start, FrameTime end);
+	
+	void note_on(uchar note_num, uchar velocity, FrameTime time, SampleCount nframes, FrameTime start, FrameTime end);
+	void note_off(uchar note_num, FrameTime time, SampleCount nframes, FrameTime start, FrameTime end);
+	void all_notes_off(FrameTime time, SampleCount nframes, FrameTime start, FrameTime end);
+
+	void sustain_on(FrameTime time, SampleCount nframes, FrameTime start, FrameTime end);
+	void sustain_off(FrameTime time, SampleCount nframes, FrameTime start, FrameTime end);
+
+private:
+	/** Key, one for each key on the keyboard */
+	struct Key {
+		enum State { OFF, ON_ASSIGNED, ON_UNASSIGNED };
+		Key() : state(OFF), voice(0), time(0) {}
+		State state; size_t voice; SampleCount time;
+	};
+
+	/** Voice, one of these always exists for each voice */
+	struct Voice {
+		enum State { FREE, ACTIVE, HOLDING };
+		Voice() : state(FREE), note(0) {}
+		State state; uchar note; SampleCount time;
+	};
+
+	float note_to_freq(int num);
+	void free_voice(size_t voice, FrameTime time, SampleCount nframes, FrameTime start, FrameTime end);
+
+	Voice* _voices;
+	Key    _keys[128];
+	bool   _sustain;   ///< Whether or not hold pedal is depressed
+	
+	InputPort*  _midi_in_port;
+	OutputPort* _freq_port;
+	OutputPort* _vel_port;
+	OutputPort* _gate_port;
+	OutputPort* _trig_port;
+};
+
+
+} // namespace Ingen
+
+#endif // MIDINOTENODE_H