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diff --git a/src/libs/engine/Connection.hpp b/src/libs/engine/Connection.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 CONNECTION_H
+#define CONNECTION_H
+
+#include <cstdlib>
+#include <boost/utility.hpp>
+#include <raul/Deletable.hpp>
+#include "DataType.hpp"
+#include "Port.hpp"
+#include "types.hpp"
+
+namespace Ingen {
+
+class Port;
+class Buffer;
+
+
+/** Represents a single inbound connection for an InputPort.
+ *
+ * This can be a group of ports (ie coming from a polyphonic Node) or
+ * a single Port.  This class exists basically as an abstraction of mixing
+ * down polyphonic inputs, so InputPort can just deal with mixing down
+ * multiple connections (oblivious to the polyphonic situation of the
+ * connection itself).
+ *
+ * \ingroup engine
+ */
+class Connection : public Raul::Deletable
+{
+public:
+	Connection(Port* src_port, Port* dst_port);
+	virtual ~Connection();
+	
+	Port* src_port() const { return _src_port; }
+	Port* dst_port() const { return _dst_port; }
+
+	/** Used by some (recursive) events to prevent double disconnections */
+	bool pending_disconnection()       { return _pending_disconnection; }
+	void pending_disconnection(bool b) { _pending_disconnection = b; }
+	
+	void process(SampleCount nframes, FrameTime start, FrameTime end);
+
+	/** Get the buffer for a particular voice.
+	 * A Connection is smart - it knows the destination port requesting the
+	 * buffer, and will return accordingly (ie the same buffer for every voice
+	 * in a mono->poly connection).
+	 */
+	inline Buffer* buffer(size_t voice) const;
+	
+	void set_buffer_size(size_t size);
+
+	DataType type() const { return _src_port->type(); }
+
+protected:
+	Port* const _src_port;
+	Port* const _dst_port;
+	Buffer*     _local_buffer;
+	size_t      _buffer_size;
+	bool        _must_mix;
+	bool        _pending_disconnection;
+};
+
+
+inline Buffer*
+Connection::buffer(size_t voice) const
+{
+	if (_must_mix)
+		return _local_buffer;
+	else if (_src_port->poly() == 1)
+		return _src_port->buffer(0);
+	else
+		return _src_port->buffer(voice);
+}
+
+
+} // namespace Ingen
+
+#endif // CONNECTION_H