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diff --git a/src/engine/MachineBuilder.hpp b/src/engine/MachineBuilder.hpp
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+++ b/src/engine/MachineBuilder.hpp
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+/*
+  This file is part of Machina.
+  Copyright 2007-2013 David Robillard <http://drobilla.net>
+
+  Machina 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 3 of the License, or any later version.
+
+  Machina 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.
+
+  You should have received a copy of the GNU General Public License
+  along with Machina.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef MACHINA_MACHINEBUILDER_HPP
+#define MACHINA_MACHINEBUILDER_HPP
+
+#include <stdint.h>
+
+#include <list>
+
+#include "machina/types.hpp"
+#include "raul/TimeStamp.hpp"
+
+namespace machina {
+
+class Machine;
+class Node;
+
+class MachineBuilder
+{
+public:
+	MachineBuilder(SPtr<Machine> machine,
+	               double        quantization,
+	               bool          step);
+
+	void event(Raul::TimeStamp time, size_t size, unsigned char* buf);
+
+	void set_step(bool step) { _step = step; }
+
+	void reset();
+	void resolve();
+
+	SPtr<Machine> finish();
+
+private:
+	bool is_delay_node(SPtr<Node> node) const;
+	void set_node_duration(SPtr<Node> node, Raul::TimeDuration d) const;
+
+	void note_on(Raul::TimeStamp t, size_t ev_size, uint8_t* buf);
+
+	void resolve_note(Raul::TimeStamp t,
+	                  size_t          ev_size,
+	                  uint8_t*        buf,
+	                  SPtr<Node>      resolved);
+
+	SPtr<Node>connect_nodes(SPtr<Machine>   m,
+	                        SPtr<Node>      tail,
+	                        Raul::TimeStamp tail_end_time,
+	                        SPtr<Node>      head,
+	                        Raul::TimeStamp head_start_time);
+
+	Raul::TimeStamp default_duration() {
+		return _step ? _step_duration : Raul::TimeStamp(_time.unit(), 0, 0);
+	}
+
+	typedef std::list<SPtr<Node> > ActiveList;
+	ActiveList _active_nodes;
+
+	typedef std::list<std::pair<Raul::TimeStamp, SPtr<Node> > > PolyList;
+	PolyList _poly_nodes;
+
+	double          _quantization;
+	Raul::TimeStamp _time;
+	SPtr<Machine>   _machine;
+	SPtr<Node>      _initial_node;
+	SPtr<Node>      _connect_node;
+	Raul::TimeStamp _connect_node_end_time;
+	Raul::TimeStamp _step_duration;
+	bool            _step;
+};
+
+} // namespace machina
+
+#endif // MACHINA_MACHINEBUILDER_HPP