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diff --git a/src/positionfilter.h b/src/positionfilter.h
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+/* -*- Mode: c++ -*- */
+/***************************************************************************
+ *            positionfilter.h
+ *
+ *  Sat 13 Feb 2021 12:46:41 CET
+ *  Copyright 2019 André Nusser
+ *  andre.nusser@googlemail.com
+ ****************************************************************************/
+
+/*
+ *  This file is part of DrumGizmo.
+ *
+ *  DrumGizmo is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU Lesser General Public License as published by
+ *  the Free Software Foundation; either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  DrumGizmo 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 Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public License
+ *  along with DrumGizmo; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA.
+ */
+#pragma once
+
+#include <cstddef>
+#include <map>
+#include <utility>
+
+#include "inputfilter.h"
+#include "instrument.h"
+
+struct Settings;
+class Random;
+
+class PositionFilter
+	: public InputFilter
+{
+public:
+	PositionFilter(Settings& settings, Random& random);
+
+	bool filter(event_t& event, std::size_t pos) override;
+
+	// Note getLatency not overloaded because this filter doesn't add latency.
+
+private:
+	Settings& settings;
+	Random& random;
+};