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diff --git a/src/server/internals/Note.hpp b/src/server/internals/Note.hpp
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+/* This file is part of Ingen.
+ * Copyright 2007-2011 David 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 INGEN_INTERNALS_NOTE_HPP
+#define INGEN_INTERNALS_NOTE_HPP
+
+#include <string>
+#include "types.hpp"
+#include "NodeImpl.hpp"
+
+namespace Ingen {
+namespace Server {
+
+class InputPort;
+class OutputPort;
+class InternalPlugin;
+
+namespace Internals {
+
+/** MIDI note input node.
+ *
+ * For pitched instruments like keyboard, etc.
+ *
+ * \ingroup engine
+ */
+class NoteNode : public NodeImpl
+{
+public:
+	NoteNode(
+			InternalPlugin*    plugin,
+			BufferFactory&     bufs,
+			const std::string& path,
+			bool               polyphonic,
+			PatchImpl*         parent,
+			SampleRate         srate);
+
+	~NoteNode();
+
+	bool prepare_poly(BufferFactory& bufs, uint32_t poly);
+	bool apply_poly(Raul::Maid& maid, uint32_t poly);
+
+	void process(ProcessContext& context);
+
+	void note_on(ProcessContext& context, uint8_t note_num, uint8_t velocity, FrameTime time);
+	void note_off(ProcessContext& context, uint8_t note_num, FrameTime time);
+	void all_notes_off(ProcessContext& context, FrameTime time);
+
+	void sustain_on(ProcessContext& context, FrameTime time);
+	void sustain_off(ProcessContext& context, FrameTime time);
+
+	static InternalPlugin* internal_plugin(Shared::LV2URIMap& uris);
+
+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; uint32_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), time(0) {}
+		State state; uint8_t note; SampleCount time;
+	};
+
+	float note_to_freq(int num);
+	void free_voice(ProcessContext& context, uint32_t voice, FrameTime time);
+
+	Raul::Array<Voice>* _voices;
+	Raul::Array<Voice>* _prepared_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 Server
+} // namespace Ingen
+} // namespace Internals
+
+#endif // INGEN_INTERNALS_NOTE_HPP