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diff --git a/src/engine/PortImpl.hpp b/src/engine/PortImpl.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 PORTIMPL_H
+#define PORTIMPL_H
+
+#include <cstdlib>
+#include <string>
+#include <raul/Array.hpp>
+#include "interface/Port.hpp"
+#include "types.hpp"
+#include "GraphObjectImpl.hpp"
+#include "interface/DataType.hpp"
+#include "Buffer.hpp"
+#include "Context.hpp"
+
+namespace Raul { class Maid; class Atom; }
+
+namespace Ingen {
+
+class NodeImpl;
+class Buffer;
+class ProcessContext;
+
+
+/** A port on a Node.
+ *
+ * This is a non-template abstract base class, which basically exists so
+ * things can pass around Port pointers and not have to worry about type,
+ * templates, etc.
+ *
+ * \ingroup engine
+ */
+class PortImpl : public GraphObjectImpl, public Ingen::Shared::Port
+{
+public:
+	virtual ~PortImpl();
+
+	/** A port's parent is always a node, so static cast should be safe */
+	NodeImpl* parent_node() const { return (NodeImpl*)_parent; }
+	
+	bool set_polyphonic(Raul::Maid& maid, bool p);
+	
+	/** Prepare for a new (external) polyphony value.
+	 *
+	 * Preprocessor thread, poly is actually applied by apply_poly.
+	 */
+	virtual bool prepare_poly(uint32_t poly);
+	
+	/** Apply a new polyphony value.
+	 *
+	 * Audio thread.
+	 *
+	 * \param poly Must be < the most recent value passed to prepare_poly.
+	 */
+	virtual bool apply_poly(Raul::Maid& maid, uint32_t poly);
+	
+	const Raul::Atom& value() const { return _value; }
+	void              set_value(const Raul::Atom& v) { _value = v; }
+
+	inline Buffer* buffer(uint32_t voice) const {
+		Buffer* const buf = _buffers->at(voice);
+		if (buf->is_joined()) {
+			assert(buf->joined_buffer());
+			return buf->joined_buffer();
+		} else {
+			return buf;
+		}
+	}
+
+	/** Called once per process cycle */
+	virtual void pre_process(ProcessContext& context) = 0;
+	virtual void process(ProcessContext& context) {};
+	virtual void post_process(ProcessContext& context) = 0;
+	
+	/** Empty buffer contents completely (ie silence) */
+	virtual void clear_buffers();
+
+	virtual bool is_input()  const = 0;
+	virtual bool is_output() const = 0;
+
+	uint32_t     index()       const { return _index; }
+	uint32_t     poly()        const { return _poly; }
+	DataType     type()        const { return _type; }
+	size_t       buffer_size() const { return _buffer_size; }
+
+	virtual void set_buffer_size(size_t size);
+	
+	void fixed_buffers(bool b) { _fixed_buffers = b; }
+	bool fixed_buffers()       { return _fixed_buffers; }
+	
+	void broadcast(bool b) { _broadcast = b; }
+	bool broadcast()       { return _broadcast; }
+
+	void raise_set_by_user_flag() { _set_by_user = true; }
+
+	Context::ID context() const            { return _context; }
+	void        set_context(Context::ID c) { _context = c; }
+
+protected:
+	PortImpl(NodeImpl*          node,
+	         const std::string& name,
+	         uint32_t           index,
+	         uint32_t           poly,
+	         DataType           type,
+	         const Raul::Atom&  value,
+	         size_t             buffer_size);
+	
+	virtual void allocate_buffers();
+	virtual void connect_buffers();
+	virtual void broadcast(ProcessContext& context);
+
+	uint32_t   _index;
+	uint32_t   _poly;
+	uint32_t   _buffer_size;
+	DataType   _type;
+	Raul::Atom _value;
+	bool       _fixed_buffers;
+	bool       _broadcast;
+	bool       _set_by_user;
+	Sample     _last_broadcasted_value;
+
+	Context::ID           _context;
+	Raul::Array<Buffer*>* _buffers;
+
+	// Dynamic polyphony
+	Raul::Array<Buffer*>* _prepared_buffers;
+};
+
+
+} // namespace Ingen
+
+#endif // PORTIMPL_H