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diff --git a/src/server/internals/Trigger.hpp b/src/server/internals/Trigger.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_TRIGGER_HPP
+#define INGEN_INTERNALS_TRIGGER_HPP
+
+#include "InternalBlock.hpp"
+
+namespace Ingen {
+namespace Server {
+
+class InputPort;
+class OutputPort;
+class InternalPlugin;
+
+namespace Internals {
+
+/** MIDI trigger input block.
+ *
+ * Just has a gate, for drums etc.  A control port is used to select
+ * which note number is responded to.
+ *
+ * Note that this block is always monophonic, the poly parameter is ignored.
+ * (Should that change?)
+ *
+ * \ingroup engine
+ */
+class TriggerNode : public InternalBlock
+{
+public:
+	TriggerNode(InternalPlugin*     plugin,
+	            BufferFactory&      bufs,
+	            const Raul::Symbol& symbol,
+	            bool                polyphonic,
+	            GraphImpl*          parent,
+	            SampleRate          srate);
+
+	void run(RunContext& context);
+
+	bool note_on(RunContext& context, uint8_t note_num, uint8_t velocity, FrameTime time);
+	bool note_off(RunContext& context, uint8_t note_num, FrameTime time);
+
+	void learn() { _learning = true; }
+
+	static InternalPlugin* internal_plugin(URIs& uris);
+
+private:
+	bool _learning;
+
+	InputPort*  _midi_in_port;
+	OutputPort* _midi_out_port;
+	InputPort*  _note_port;
+	OutputPort* _gate_port;
+	OutputPort* _trig_port;
+	OutputPort* _vel_port;
+};
+
+} // namespace Server
+} // namespace Ingen
+} // namespace Internals
+
+#endif // INGEN_INTERNALS_TRIGGER_HPP