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diff --git a/cinelerra-5.1/plugins/flanger/flanger.h b/cinelerra-5.1/plugins/flanger/flanger.h
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+
+/*
+ * CINELERRA
+ * Copyright (C) 2008-2019 Adam Williams <broadcast at earthling dot net>
+ * 
+ * This program 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.
+ * 
+ * This program 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 more 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ * 
+ */
+
+#ifndef FLANGER_H
+#define FLANGER_H
+
+class Flanger;
+
+#include "pluginaclient.h"
+
+
+class FlangerConfig
+{
+public:
+	FlangerConfig();
+
+
+	int equivalent(FlangerConfig &that);
+	void copy_from(FlangerConfig &that);
+	void interpolate(FlangerConfig &prev, 
+		FlangerConfig &next, 
+		int64_t prev_frame, 
+		int64_t next_frame, 
+		int64_t current_frame);
+	void boundaries();
+
+// phase offset in ms
+	float offset;
+// starting position of oscillation in %
+	float starting_phase;
+// how much the phase oscillates in ms
+	float depth;
+// rate of phase oscillation in Hz
+	float rate;
+// how much of input signal
+	float wetness;
+};
+
+
+// state of a single voice
+class Voice
+{
+public:
+    Voice();
+
+// position in the waveform table
+    int table_offset;
+};
+
+// each sample in the flanging waveform
+typedef struct 
+{
+    double input_sample;
+    double input_period;
+} flange_sample_t;
+
+class Flanger : public PluginAClient
+{
+public:
+	Flanger(PluginServer *server);
+	~Flanger();
+
+	void update_gui();
+
+
+
+// required for all realtime/multichannel plugins
+	PLUGIN_CLASS_MEMBERS(FlangerConfig);
+    int process_buffer(int64_t size, 
+	    Samples *buffer, 
+	    int64_t start_position,
+	    int sample_rate);
+    void reallocate_dsp(int new_dsp_allocated);
+    void reallocate_history(int new_allocation);
+
+	int is_realtime();
+	int is_synthesis();
+	int is_multichannel();
+	void save_data(KeyFrame *keyframe);
+	void read_data(KeyFrame *keyframe);
+
+	double *history_buffer;
+// Number of samples in the history buffer 
+	int64_t history_size;
+
+// the temporary all voices are painted on
+	double *dsp_in;
+    int dsp_in_allocated;
+
+    Voice voice;
+// flanging table is a whole number of samples that repeats
+// always an even number
+    int table_size;
+    flange_sample_t *flanging_table;
+
+// detect seeking
+    int64_t last_position;
+
+	int need_reconfigure;
+};
+
+
+
+
+
+class FlangerWindow : public PluginClientWindow
+{
+public:
+	FlangerWindow(Flanger *plugin);
+	~FlangerWindow();
+	
+	void create_objects();
+    void update();
+    void param_updated();
+
+	Flanger *plugin;
+    PluginParam *offset;
+    PluginParam *starting_phase;
+    PluginParam *depth;
+    PluginParam *rate;
+    PluginParam *wetness;
+};
+
+
+
+
+#endif
+
+
+