diff --git a/grc/CMakeLists.txt b/grc/CMakeLists.txt
index f931f0a..5a7c7a5 100644
--- a/grc/CMakeLists.txt
+++ b/grc/CMakeLists.txt
@@ -20,11 +20,11 @@ install(FILES
     multirds_rds_table_qt.xml
     multirds_rds_parser_table_qt.xml
     multirds_rds_decoder.xml
-    multirds_max_freq.xml
+    multirds_station_search.xml
     multirds_stream_selector.xml
     multirds_vector_cutter.xml
     multirds_decoder_compare.xml
-    multirds_sync_decim.xml
+    multirds_symbol_combiner.xml
     multirds_rds_decoder_redsea.xml
     multirds_qtgui_range.xml
     multirds_variable_setter.xml
diff --git a/grc/multirds_max_freq.xml b/grc/multirds_station_search.xml
similarity index 90%
rename from grc/multirds_max_freq.xml
rename to grc/multirds_station_search.xml
index b5ba561..aacb8fb 100644
--- a/grc/multirds_max_freq.xml
+++ b/grc/multirds_station_search.xml
@@ -1,10 +1,10 @@
 <?xml version="1.0"?>
 <block>
-  <name>max_freq</name>
-  <key>multirds_max_freq</key>
+  <name>station_search</name>
+  <key>multirds_station_search</key>
   <category>[multirds]</category>
   <import>import multirds</import>
-  <make>multirds.max_freq($fft_len, $num_decoders, $center_freq, $samp_rate,$round_to,$debug)</make>
+  <make>multirds.station_search($fft_len, $num_decoders, $center_freq, $samp_rate,$round_to,$debug)</make>
   <!-- Make one 'param' node for every Parameter you want settable from the GUI.
        Sub-nodes:
        * name
diff --git a/grc/multirds_sync_decim.xml b/grc/multirds_symbol_combiner.xml
similarity index 92%
rename from grc/multirds_sync_decim.xml
rename to grc/multirds_symbol_combiner.xml
index 105540e..ae8400c 100644
--- a/grc/multirds_sync_decim.xml
+++ b/grc/multirds_symbol_combiner.xml
@@ -1,10 +1,10 @@
 <?xml version="1.0"?>
 <block>
-  <name>sync_decim</name>
-  <key>multirds_sync_decim</key>
+  <name>symbol_combiner</name>
+  <key>multirds_symbol_combiner</key>
   <category>[multirds]</category>
   <import>import multirds</import>
-  <make>multirds.sync_decim($threshold, $min_diff, $log)</make>
+  <make>multirds.symbol_combiner($threshold, $min_diff, $log)</make>
   <!-- Make one 'param' node for every Parameter you want settable from the GUI.
        Sub-nodes:
        * name
diff --git a/include/multirds/CMakeLists.txt b/include/multirds/CMakeLists.txt
index 718d2fc..5ef59ee 100644
--- a/include/multirds/CMakeLists.txt
+++ b/include/multirds/CMakeLists.txt
@@ -23,7 +23,7 @@
 install(FILES
     api.h
     rds_decoder.h
-    sync_decim.h
+    symbol_combiner.h
     rds_decoder_redsea.h
     stream_router.h DESTINATION include/multirds
 )
diff --git a/include/multirds/sync_decim.h b/include/multirds/symbol_combiner.h
similarity index 74%
rename from include/multirds/sync_decim.h
rename to include/multirds/symbol_combiner.h
index 6b1f3b8..28aca40 100644
--- a/include/multirds/sync_decim.h
+++ b/include/multirds/symbol_combiner.h
@@ -19,8 +19,8 @@
  */
 
 
-#ifndef INCLUDED_MULTIRDS_SYNC_DECIM_H
-#define INCLUDED_MULTIRDS_SYNC_DECIM_H
+#ifndef INCLUDED_MULTIRDS_SYMBOL_COMBINER_H
+#define INCLUDED_MULTIRDS_SYMBOL_COMBINER_H
 
 #include <multirds/api.h>
 #include <gnuradio/sync_decimator.h>
@@ -33,17 +33,17 @@ namespace gr {
      * \ingroup multirds
      *
      */
-    class MULTIRDS_API sync_decim : virtual public gr::sync_decimator
+    class MULTIRDS_API symbol_combiner : virtual public gr::sync_decimator
     {
      public:
-      typedef boost::shared_ptr<sync_decim> sptr;
+      typedef boost::shared_ptr<symbol_combiner> sptr;
 
       /*!
-       * \brief Return a shared_ptr to a new instance of multirds::sync_decim.
+       * \brief Return a shared_ptr to a new instance of multirds::symbol_combiner.
        *
-       * To avoid accidental use of raw pointers, multirds::sync_decim's
+       * To avoid accidental use of raw pointers, multirds::symbol_combiner's
        * constructor is in a private implementation
-       * class. multirds::sync_decim::make is the public interface for
+       * class. multirds::symbol_combiner::make is the public interface for
        * creating new instances.
        */
       static sptr make(float threshold,float min_diff,bool log);
@@ -52,5 +52,5 @@ namespace gr {
   } // namespace multirds
 } // namespace gr
 
-#endif /* INCLUDED_MULTIRDS_SYNC_DECIM_H */
+#endif /* INCLUDED_MULTIRDS_SYMBOL_COMBINER_H */
 
diff --git a/lib/CMakeLists.txt b/lib/CMakeLists.txt
index 9983586..4599e9b 100644
--- a/lib/CMakeLists.txt
+++ b/lib/CMakeLists.txt
@@ -26,7 +26,7 @@ include_directories(${Boost_INCLUDE_DIR})
 link_directories(${Boost_LIBRARY_DIRS})
 list(APPEND multirds_sources
     rds_decoder_impl.cc
-    sync_decim_impl.cc
+    symbol_combiner_impl.cc
     rds_decoder_redsea_impl.cc
     stream_router_impl.cc )
 
diff --git a/lib/sync_decim_impl.cc b/lib/symbol_combiner_impl.cc
similarity index 92%
rename from lib/sync_decim_impl.cc
rename to lib/symbol_combiner_impl.cc
index 418f68f..66a5b66 100644
--- a/lib/sync_decim_impl.cc
+++ b/lib/symbol_combiner_impl.cc
@@ -23,7 +23,7 @@
 #endif
 
 #include <gnuradio/io_signature.h>
-#include "sync_decim_impl.h"
+#include "symbol_combiner_impl.h"
 #define DECIM 2
 #define lout log && std::cout
 //#define SYNC_COUNTER_MAX 5//higher value -> slower sync, less cpu load
@@ -32,18 +32,18 @@
 namespace gr {
   namespace multirds {
     
-    sync_decim::sptr
-    sync_decim::make(float threshold,float min_diff,bool log)
+    symbol_combiner::sptr
+    symbol_combiner::make(float threshold,float min_diff,bool log)
     {
       return gnuradio::get_initial_sptr
-      (new sync_decim_impl(threshold, min_diff, log));
+      (new symbol_combiner_impl(threshold, min_diff, log));
     }
     
     /*
      * The private constructor
      */
-    sync_decim_impl::sync_decim_impl(float threshold,float min_diff,bool log)
-    : gr::sync_decimator("sync_decim",
+    symbol_combiner_impl::symbol_combiner_impl(float threshold,float min_diff,bool log)
+    : gr::sync_decimator("symbol_combiner",
         gr::io_signature::make(1, 1, sizeof(float)),
         gr::io_signature::make(1, 1, sizeof(float)), DECIM),
         threshold(threshold),
@@ -52,7 +52,7 @@ namespace gr {
         
         {
           message_port_register_in(pmt::mp("ctrl"));
-          set_msg_handler(pmt::mp("ctrl"), boost::bind(&sync_decim_impl::parse_ctrl_msg, this, _1));
+          set_msg_handler(pmt::mp("ctrl"), boost::bind(&symbol_combiner_impl::parse_ctrl_msg, this, _1));
           message_port_register_out(pmt::mp("ctrl"));
           //init persistant vars
           last_input=0;
@@ -64,11 +64,11 @@ namespace gr {
         /*
         * Our virtual destructor.
         */
-        sync_decim_impl::~sync_decim_impl()
+        symbol_combiner_impl::~symbol_combiner_impl()
         {
         }
         
-        void sync_decim_impl::parse_ctrl_msg(pmt::pmt_t pdu) {
+        void symbol_combiner_impl::parse_ctrl_msg(pmt::pmt_t pdu) {
           if(!pmt::is_pair(pdu)) {
           lout << "wrong input message (not a PDU)" << std::endl;
           return;
@@ -90,7 +90,7 @@ namespace gr {
         
         
         int
-        sync_decim_impl::work(int noutput_items,
+        symbol_combiner_impl::work(int noutput_items,
                               gr_vector_const_void_star &input_items,
                               gr_vector_void_star &output_items)
         {
diff --git a/lib/sync_decim_impl.h b/lib/symbol_combiner_impl.h
similarity index 80%
rename from lib/sync_decim_impl.h
rename to lib/symbol_combiner_impl.h
index 1704ec8..d00dc29 100644
--- a/lib/sync_decim_impl.h
+++ b/lib/symbol_combiner_impl.h
@@ -18,22 +18,22 @@
  * Boston, MA 02110-1301, USA.
  */
 
-#ifndef INCLUDED_MULTIRDS_SYNC_DECIM_IMPL_H
-#define INCLUDED_MULTIRDS_SYNC_DECIM_IMPL_H
+#ifndef INCLUDED_MULTIRDS_SYMBOL_COMBINER_IMPL_H
+#define INCLUDED_MULTIRDS_SYMBOL_COMBINER_IMPL_H
 
-#include <multirds/sync_decim.h>
+#include <multirds/symbol_combiner.h>
 
 namespace gr {
   namespace multirds {
 
-    class sync_decim_impl : public sync_decim
+    class symbol_combiner_impl : public symbol_combiner
     {
      private:
       // Nothing to declare in this block.
 
      public:
-      sync_decim_impl(float threshold,float min_diff,bool log);
-      ~sync_decim_impl();
+      symbol_combiner_impl(float threshold,float min_diff,bool log);
+      ~symbol_combiner_impl();
 
       // Where all the action really happens
       int work(int noutput_items,
@@ -54,5 +54,5 @@ namespace gr {
   } // namespace multirds
 } // namespace gr
 
-#endif /* INCLUDED_MULTIRDS_SYNC_DECIM_IMPL_H */
+#endif /* INCLUDED_MULTIRDS_SYMBOL_COMBINER_IMPL_H */
 
diff --git a/python/CMakeLists.txt b/python/CMakeLists.txt
index ff8abf4..77df1fc 100644
--- a/python/CMakeLists.txt
+++ b/python/CMakeLists.txt
@@ -33,7 +33,7 @@ GR_PYTHON_INSTALL(
     __init__.py
     rds_table_qt.py
     rds_parser_table_qt.py
-    max_freq.py
+    station_search.py
     chart.py
     stream_selector.py
     vector_cutter.py
diff --git a/python/RDS-decoder-instanciation.grc b/python/RDS-decoder-instanciation.grc
new file mode 100644
index 0000000..3f4b0d5
--- /dev/null
+++ b/python/RDS-decoder-instanciation.grc
@@ -0,0 +1,219 @@
+<?xml version='1.0' encoding='utf-8'?>
+<?grc format='1' created='3.7.11'?>
+<flow_graph>
+  <timestamp>Thu Jun  8 13:29:17 2017</timestamp>
+  <block>
+    <key>options</key>
+    <param>
+      <key>author</key>
+      <value></value>
+    </param>
+    <param>
+      <key>window_size</key>
+      <value></value>
+    </param>
+    <param>
+      <key>category</key>
+      <value>[GRC Hier Blocks]</value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>description</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(8, 8)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>generate_options</key>
+      <value>qt_gui</value>
+    </param>
+    <param>
+      <key>hier_block_src_path</key>
+      <value>.:</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>top_block</value>
+    </param>
+    <param>
+      <key>max_nouts</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>qt_qss_theme</key>
+      <value></value>
+    </param>
+    <param>
+      <key>realtime_scheduling</key>
+      <value></value>
+    </param>
+    <param>
+      <key>run_command</key>
+      <value>{python} -u {filename}</value>
+    </param>
+    <param>
+      <key>run_options</key>
+      <value>prompt</value>
+    </param>
+    <param>
+      <key>run</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>thread_safe_setters</key>
+      <value></value>
+    </param>
+    <param>
+      <key>title</key>
+      <value></value>
+    </param>
+  </block>
+  <block>
+    <key>variable</key>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(8, 160)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>samp_rate</value>
+    </param>
+    <param>
+      <key>value</key>
+      <value>32000</value>
+    </param>
+  </block>
+  <block>
+    <key>blocks_null_source</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>bus_conns</key>
+      <value>[[0,],]</value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(471, 191)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>blocks_null_source_0</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>num_outputs</key>
+      <value>1</value>
+    </param>
+    <param>
+      <key>type</key>
+      <value>byte</value>
+    </param>
+    <param>
+      <key>vlen</key>
+      <value>1</value>
+    </param>
+  </block>
+  <block>
+    <key>multirds_rds_decoder_redsea</key>
+    <param>
+      <key>alias</key>
+      <value></value>
+    </param>
+    <param>
+      <key>comment</key>
+      <value></value>
+    </param>
+    <param>
+      <key>affinity</key>
+      <value></value>
+    </param>
+    <param>
+      <key>debug</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_enabled</key>
+      <value>True</value>
+    </param>
+    <param>
+      <key>_coordinate</key>
+      <value>(662, 111)</value>
+    </param>
+    <param>
+      <key>_rotation</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>id</key>
+      <value>multirds_rds_decoder_redsea_0</value>
+    </param>
+    <param>
+      <key>log</key>
+      <value>False</value>
+    </param>
+    <param>
+      <key>maxoutbuf</key>
+      <value>0</value>
+    </param>
+    <param>
+      <key>minoutbuf</key>
+      <value>0</value>
+    </param>
+  </block>
+  <connection>
+    <source_block_id>blocks_null_source_0</source_block_id>
+    <sink_block_id>multirds_rds_decoder_redsea_0</sink_block_id>
+    <source_key>0</source_key>
+    <sink_key>0</sink_key>
+  </connection>
+</flow_graph>
diff --git a/python/__init__.py b/python/__init__.py
index 5c1ba78..4575e96 100644
--- a/python/__init__.py
+++ b/python/__init__.py
@@ -35,7 +35,7 @@ except ImportError:
 
 from rds_table_qt import rds_table_qt
 from rds_parser_table_qt import rds_parser_table_qt
-from max_freq import max_freq
+from station_search import station_search
 
 from chart import Chart
 from stream_selector import stream_selector
diff --git a/python/max_freq.py b/python/station_search.py
similarity index 98%
rename from python/max_freq.py
rename to python/station_search.py
index 89bedbe..8665b23 100644
--- a/python/max_freq.py
+++ b/python/station_search.py
@@ -23,13 +23,13 @@ import numpy as np
 from gnuradio import gr
 import code,math,pmt,time,threading
 
-class max_freq(gr.sync_block):
+class station_search(gr.sync_block):
     """
-    docstring for block max_freq
+    docstring for block station_search
     """
     def __init__(self, fft_len=1024,num_decoders=4,center_freq=0,samp_rate=0,round_to=100e3,debug=False):
         gr.sync_block.__init__(self,
-            name="max_freq",
+            name="station_search",
             in_sig=[(np.float32,fft_len)],
             out_sig=None)
         self.fft_len=fft_len
diff --git a/python/top_block.py b/python/top_block.py
new file mode 100755
index 0000000..3903b7b
--- /dev/null
+++ b/python/top_block.py
@@ -0,0 +1,105 @@
+#!/usr/bin/env python2
+# -*- coding: utf-8 -*-
+##################################################
+# GNU Radio Python Flow Graph
+# Title: Top Block
+# Generated: Thu Jun  8 13:38:58 2017
+##################################################
+
+if __name__ == '__main__':
+    import ctypes
+    import sys
+    if sys.platform.startswith('linux'):
+        try:
+            x11 = ctypes.cdll.LoadLibrary('libX11.so')
+            x11.XInitThreads()
+        except:
+            print "Warning: failed to XInitThreads()"
+
+from PyQt4 import Qt
+from gnuradio import blocks
+from gnuradio import eng_notation
+from gnuradio import gr
+from gnuradio.eng_option import eng_option
+from gnuradio.filter import firdes
+from optparse import OptionParser
+import multirds
+import sys
+from gnuradio import qtgui
+
+
+class top_block(gr.top_block, Qt.QWidget):
+
+    def __init__(self):
+        gr.top_block.__init__(self, "Top Block")
+        Qt.QWidget.__init__(self)
+        self.setWindowTitle("Top Block")
+        qtgui.util.check_set_qss()
+        try:
+            self.setWindowIcon(Qt.QIcon.fromTheme('gnuradio-grc'))
+        except:
+            pass
+        self.top_scroll_layout = Qt.QVBoxLayout()
+        self.setLayout(self.top_scroll_layout)
+        self.top_scroll = Qt.QScrollArea()
+        self.top_scroll.setFrameStyle(Qt.QFrame.NoFrame)
+        self.top_scroll_layout.addWidget(self.top_scroll)
+        self.top_scroll.setWidgetResizable(True)
+        self.top_widget = Qt.QWidget()
+        self.top_scroll.setWidget(self.top_widget)
+        self.top_layout = Qt.QVBoxLayout(self.top_widget)
+        self.top_grid_layout = Qt.QGridLayout()
+        self.top_layout.addLayout(self.top_grid_layout)
+
+        self.settings = Qt.QSettings("GNU Radio", "top_block")
+        self.restoreGeometry(self.settings.value("geometry").toByteArray())
+
+        ##################################################
+        # Variables
+        ##################################################
+        self.samp_rate = samp_rate = 32000
+
+        ##################################################
+        # Blocks
+        ##################################################
+        self.multirds_rds_decoder_redsea_0 = multirds.rds_decoder_redsea(False, True)
+        self.blocks_null_source_0 = blocks.null_source(gr.sizeof_char*1)
+
+        ##################################################
+        # Connections
+        ##################################################
+        self.connect((self.blocks_null_source_0, 0), (self.multirds_rds_decoder_redsea_0, 0))    
+
+    def closeEvent(self, event):
+        self.settings = Qt.QSettings("GNU Radio", "top_block")
+        self.settings.setValue("geometry", self.saveGeometry())
+        event.accept()
+
+    def get_samp_rate(self):
+        return self.samp_rate
+
+    def set_samp_rate(self, samp_rate):
+        self.samp_rate = samp_rate
+
+
+def main(top_block_cls=top_block, options=None):
+
+    from distutils.version import StrictVersion
+    if StrictVersion(Qt.qVersion()) >= StrictVersion("4.5.0"):
+        style = gr.prefs().get_string('qtgui', 'style', 'raster')
+        Qt.QApplication.setGraphicsSystem(style)
+    qapp = Qt.QApplication(sys.argv)
+
+    tb = top_block_cls()
+    tb.start()
+    tb.show()
+
+    def quitting():
+        tb.stop()
+        tb.wait()
+    qapp.connect(qapp, Qt.SIGNAL("aboutToQuit()"), quitting)
+    qapp.exec_()
+
+
+if __name__ == '__main__':
+    main()
diff --git a/swig/multirds_swig.i b/swig/multirds_swig.i
index 9b1eae2..bedf2fb 100644
--- a/swig/multirds_swig.i
+++ b/swig/multirds_swig.i
@@ -9,7 +9,7 @@
 
 %{
 #include "multirds/rds_decoder.h"
-#include "multirds/sync_decim.h"
+#include "multirds/symbol_combiner.h"
 #include "multirds/rds_decoder_redsea.h"
 #include "multirds/stream_router.h"
 %}
@@ -17,8 +17,8 @@
 %include "multirds/rds_decoder.h"
 GR_SWIG_BLOCK_MAGIC2(multirds, rds_decoder);
 
-%include "multirds/sync_decim.h"
-GR_SWIG_BLOCK_MAGIC2(multirds, sync_decim);
+%include "multirds/symbol_combiner.h"
+GR_SWIG_BLOCK_MAGIC2(multirds, symbol_combiner);
 %include "multirds/rds_decoder_redsea.h"
 GR_SWIG_BLOCK_MAGIC2(multirds, rds_decoder_redsea);
 %include "multirds/stream_router.h"