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diff --git a/src/server/ArcImpl.hpp b/src/server/ArcImpl.hpp
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+++ b/src/server/ArcImpl.hpp
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+/*
+  This file is part of Ingen.
+  Copyright 2007-2016 David Robillard <http://drobilla.net/>
+
+  Ingen is free software: you can redistribute it and/or modify it under the
+  terms of the GNU Affero General Public License as published by the Free
+  Software Foundation, either version 3 of the License, or 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 Affero General Public License for details.
+
+  You should have received a copy of the GNU Affero General Public License
+  along with Ingen.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef INGEN_ENGINE_ARC_IMPL_HPP
+#define INGEN_ENGINE_ARC_IMPL_HPP
+
+#include "BufferRef.hpp"
+
+#include "ingen/Arc.hpp"
+#include "raul/Noncopyable.hpp"
+#include "raul/Path.hpp"
+
+#include <boost/intrusive/slist_hook.hpp>
+
+#include <cstdint>
+
+namespace ingen {
+namespace server {
+
+class InputPort;
+class PortImpl;
+class RunContext;
+
+/** Represents a single inbound connection for an InputPort.
+ *
+ * This can be a group of ports (coming from a polyphonic Block) 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).
+ *
+ * This is stored in an intrusive slist in InputPort.
+ *
+ * \ingroup engine
+ */
+class ArcImpl
+		: private Raul::Noncopyable
+		, public  Arc
+		, public  boost::intrusive::slist_base_hook<>
+{
+public:
+	ArcImpl(PortImpl* tail, PortImpl* head);
+	~ArcImpl();
+
+	inline PortImpl* tail() const { return _tail; }
+	inline PortImpl* head() const { return _head; }
+
+	const Raul::Path& tail_path() const override;
+	const Raul::Path& head_path() const override;
+
+	/** Get the buffer for a particular voice.
+	 * An Arc is smart - it knows the destination port requesting the
+	 * buffer, and will return accordingly (e.g. the same buffer for every
+	 * voice in a mono->poly arc).
+	 */
+	BufferRef buffer(const RunContext& ctx, uint32_t voice) const;
+
+	/** Whether this arc must mix down voices into a local buffer */
+	bool must_mix() const;
+
+	static bool can_connect(const PortImpl* src, const InputPort* dst);
+
+protected:
+	PortImpl* const _tail;
+	PortImpl* const _head;
+};
+
+} // namespace server
+} // namespace ingen
+
+#endif // INGEN_ENGINE_ARC_IMPL_HPP