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diff --git a/src/server/internals/Controller.hpp b/src/server/internals/Controller.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_INTERNALS_CONTROLLER_HPP
+#define INGEN_INTERNALS_CONTROLLER_HPP
+
+#include "InternalBlock.hpp"
+
+#include <cstdint>
+
+namespace ingen {
+namespace server {
+
+class InputPort;
+class OutputPort;
+class InternalPlugin;
+
+namespace internals {
+
+/** MIDI control input block.
+ *
+ * Creating one of these nodes is how a user makes "MIDI Bindings".  Note that
+ * this node will always be monophonic, the poly parameter is ignored.
+ *
+ * \ingroup engine
+ */
+class ControllerNode : public InternalBlock
+{
+public:
+	ControllerNode(InternalPlugin*      plugin,
+	               BufferFactory&       bufs,
+	               const Raul::Symbol&  symbol,
+	               bool                 polyphonic,
+	               GraphImpl*           parent,
+	               SampleRate           srate);
+
+	void run(RunContext& context) override;
+
+	bool control(RunContext& context, uint8_t control_num, uint8_t val, FrameTime time);
+
+	void learn() override { _learning = true; }
+
+	static InternalPlugin* internal_plugin(URIs& uris);
+
+private:
+	InputPort*  _midi_in_port;
+	OutputPort* _midi_out_port;
+	InputPort*  _param_port;
+	InputPort*  _log_port;
+	InputPort*  _min_port;
+	InputPort*  _max_port;
+	OutputPort* _audio_port;
+	bool        _learning;
+};
+
+} // namespace server
+} // namespace ingen
+} // namespace internals
+
+#endif // INGEN_INTERNALS_CONTROLLER_HPP