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diff --git a/cinelerra-5.1/cinelerra/ctracking.C b/cinelerra-5.1/cinelerra/ctracking.C
new file mode 100644
index 00000000..5de2a20c
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+++ b/cinelerra-5.1/cinelerra/ctracking.C
@@ -0,0 +1,178 @@
+
+/*
+ * CINELERRA
+ * Copyright (C) 2008 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
+ *
+ */
+
+#include "bcsignals.h"
+#include "cplayback.h"
+#include "ctimebar.h"
+#include "ctracking.h"
+#include "cwindow.h"
+#include "cwindowgui.h"
+#include "edl.h"
+#include "edlsession.h"
+#include "localsession.h"
+#include "mainclock.h"
+#include "maincursor.h"
+#include "mtimebar.h"
+#include "mwindow.h"
+#include "mwindowgui.h"
+#include "patchbay.h"
+#include "trackcanvas.h"
+#include "transportque.h"
+#include "zoombar.h"
+
+CTracking::CTracking(MWindow *mwindow, CWindow *cwindow)
+ : Tracking(mwindow)
+{
+	this->cwindow = cwindow;
+}
+
+CTracking::~CTracking()
+{
+}
+
+PlaybackEngine* CTracking::get_playback_engine()
+{
+	return cwindow->playback_engine;
+}
+
+int CTracking::start_playback(double new_position, int active)
+{
+	mwindow->gui->set_playing_back(1);
+	if( active )
+		mwindow->edl->local_session->set_playback_start(new_position);
+	return Tracking::start_playback(new_position);
+}
+
+int CTracking::stop_playback()
+{
+	mwindow->gui->set_playing_back(0);
+	Tracking::stop_playback();
+	mwindow->edl->local_session->set_playback_end(get_tracking_position());
+	return 0;
+}
+
+#define SCROLL_THRESHOLD .5
+
+
+int CTracking::update_scroll(double position)
+{
+	int updated_scroll = 0;
+
+	if(mwindow->edl->session->view_follows_playback)
+	{
+		TimelinePane *pane = mwindow->gui->get_focused_pane();
+		double seconds_per_pixel = (double)mwindow->edl->local_session->zoom_sample /
+			mwindow->edl->session->sample_rate;
+		double half_canvas = seconds_per_pixel *
+			pane->canvas->get_w() / 2;
+		double midpoint = mwindow->edl->local_session->view_start[pane->number] *
+			seconds_per_pixel +
+			half_canvas;
+
+		if(get_playback_engine()->command->get_direction() == PLAY_FORWARD)
+		{
+			double left_boundary = midpoint + SCROLL_THRESHOLD * half_canvas;
+			double right_boundary = midpoint + half_canvas;
+
+			if(position > left_boundary &&
+				position < right_boundary)
+			{
+				int pixels = Units::to_int64((position - left_boundary) *
+						mwindow->edl->session->sample_rate /
+						mwindow->edl->local_session->zoom_sample);
+				if(pixels)
+				{
+					mwindow->move_right(pixels);
+//printf("CTracking::update_scroll 1 %d\n", pixels);
+					updated_scroll = 1;
+				}
+			}
+		}
+		else
+		{
+			double right_boundary = midpoint - SCROLL_THRESHOLD * half_canvas;
+			double left_boundary = midpoint - half_canvas;
+
+			if(position < right_boundary &&
+				position > left_boundary &&
+				mwindow->edl->local_session->view_start > 0)
+			{
+				int pixels = Units::to_int64((right_boundary - position) *
+						mwindow->edl->session->sample_rate /
+						mwindow->edl->local_session->zoom_sample);
+				if(pixels)
+				{
+					mwindow->move_left(pixels);
+					updated_scroll = 1;
+				}
+			}
+		}
+	}
+
+	return updated_scroll;
+}
+
+void CTracking::update_tracker(double position)
+{
+	int updated_scroll = 0;
+	cwindow->gui->lock_window("CTracking::update_tracker 1");
+
+// This is going to boost the latency but we need to update the timebar
+	cwindow->gui->timebar->update(1);
+//	cwindow->gui->timebar->flash();
+	cwindow->gui->unlock_window();
+
+// Update mwindow cursor
+	mwindow->gui->lock_window("CTracking::update_tracker 2");
+
+	mwindow->edl->local_session->set_selectionstart(position);
+	mwindow->edl->local_session->set_selectionend(position);
+
+	updated_scroll = update_scroll(position);
+
+	mwindow->gui->mainclock->update(position);
+	mwindow->gui->update_patchbay();
+	mwindow->gui->update_timebar(0);
+
+	if(!updated_scroll)
+	{
+		mwindow->gui->update_cursor();
+		// we just need to update clocks, not everything
+		mwindow->gui->zoombar->update_clocks();
+
+		for(int i = 0; i < TOTAL_PANES; i++)
+			if(mwindow->gui->pane[i])
+				mwindow->gui->pane[i]->canvas->flash(0);
+	}
+
+	mwindow->gui->flush();
+	mwindow->gui->unlock_window();
+
+// Plugin GUI's hold lock on mwindow->gui here during user interface handlers.
+	mwindow->update_plugin_guis();
+
+
+	update_meters((int64_t)(position * mwindow->edl->session->sample_rate));
+}
+
+void CTracking::draw()
+{
+}