diff --git a/about_dialog.cpp b/about_dialog.cpp
index 0defeb7..58a3ec2 100644
--- a/about_dialog.cpp
+++ b/about_dialog.cpp
@@ -3,7 +3,7 @@
 *
 * Author: Teunis van Beelen
 *
-* Copyright (C) 2015, 2016, 2017 Teunis van Beelen
+* Copyright (C) 2015, 2016, 2017, 2018 Teunis van Beelen
 *
 * Email: teuniz@gmail.com
 *
@@ -58,7 +58,7 @@ UI_Aboutwindow::UI_Aboutwindow()
   textedit1->setPlainText(
         "\n " PROGRAM_NAME " " PROGRAM_VERSION "\n"
         "\n This program is made by Teunis van Beelen.\n"
-        "\n Copyright (C) 2015, 2016, 2017 Teunis van Beelen.\n"
+        "\n Copyright (C) 2015, 2016, 2017, 2018 Teunis van Beelen.\n"
         "\n Email: teuniz@gmail.com\n"
         "\n Disclaimer:\n"
         " Despite this software is intend to be useful, there is no warranty, use this software at your own risk!\n");
diff --git a/about_dialog.h b/about_dialog.h
index 778308b..4a58a12 100644
--- a/about_dialog.h
+++ b/about_dialog.h
@@ -3,7 +3,7 @@
 *
 * Author: Teunis van Beelen
 *
-* Copyright (C) 2015, 2016, 2017 Teunis van Beelen
+* Copyright (C) 2015, 2016, 2017, 2018 Teunis van Beelen
 *
 * Email: teuniz@gmail.com
 *
diff --git a/connection.cpp b/connection.cpp
index 308c637..292e25e 100644
--- a/connection.cpp
+++ b/connection.cpp
@@ -3,7 +3,7 @@
 *
 * Author: Teunis van Beelen
 *
-* Copyright (C) 2015, 2016, 2017 Teunis van Beelen
+* Copyright (C) 2015, 2016, 2017, 2018 Teunis van Beelen
 *
 * Email: teuniz@gmail.com
 *
diff --git a/connection.h b/connection.h
index 0991981..2fbcb92 100644
--- a/connection.h
+++ b/connection.h
@@ -3,7 +3,7 @@
 *
 * Author: Teunis van Beelen
 *
-* Copyright (C) 2015, 2016, 2017 Teunis van Beelen
+* Copyright (C) 2015, 2016, 2017, 2018 Teunis van Beelen
 *
 * Email: teuniz@gmail.com
 *
diff --git a/decode_dialog.cpp b/decode_dialog.cpp
index 06b1ace..b2a8c71 100644
--- a/decode_dialog.cpp
+++ b/decode_dialog.cpp
@@ -3,7 +3,7 @@
 *
 * Author: Teunis van Beelen
 *
-* Copyright (C) 2016, 2017 Teunis van Beelen
+* Copyright (C) 2016, 2017, 2018 Teunis van Beelen
 *
 * Email: teuniz@gmail.com
 *
diff --git a/decode_dialog.h b/decode_dialog.h
index 0c5c1ee..de27deb 100644
--- a/decode_dialog.h
+++ b/decode_dialog.h
@@ -3,7 +3,7 @@
 *
 * Author: Teunis van Beelen
 *
-* Copyright (C) 2016, 2017 Teunis van Beelen
+* Copyright (C) 2016, 2017, 2018 Teunis van Beelen
 *
 * Email: teuniz@gmail.com
 *
diff --git a/edflib.c b/edflib.c
index e0b98eb..f505e18 100644
--- a/edflib.c
+++ b/edflib.c
@@ -1,7 +1,7 @@
 /*
 *****************************************************************************
 *
-* Copyright (c) 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017 Teunis van Beelen
+* Copyright (c) 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018 Teunis van Beelen
 * All rights reserved.
 *
 * email: teuniz@gmail.com
diff --git a/edflib.h b/edflib.h
index 1a1c1e2..2250a53 100644
--- a/edflib.h
+++ b/edflib.h
@@ -1,7 +1,7 @@
 /*
 *****************************************************************************
 *
-* Copyright (c) 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017 Teunis van Beelen
+* Copyright (c) 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018 Teunis van Beelen
 * All rights reserved.
 *
 * email: teuniz@gmail.com
@@ -63,7 +63,11 @@
 #define EDFLIB_FILETYPE_BDFPLUS              3
 #define EDFLIB_MALLOC_ERROR                 -1
 #define EDFLIB_NO_SUCH_FILE_OR_DIRECTORY    -2
+
+/* when this error occurs, try to open the file with EDFbrowser,
+   it will give you full details about the cause of the error. */
 #define EDFLIB_FILE_CONTAINS_FORMAT_ERRORS  -3
+
 #define EDFLIB_MAXFILES_REACHED             -4
 #define EDFLIB_FILE_READ_ERROR              -5
 #define EDFLIB_FILE_ALREADY_OPENED          -6
@@ -99,6 +103,25 @@ extern "C" {
 /* For more info about the EDF and EDF+ format, visit: http://edfplus.info/specs/ */
 /* For more info about the BDF and BDF+ format, visit: http://www.teuniz.net/edfbrowser/bdfplus%20format%20description.html */
 
+/*
+ * note: In EDF, the sensitivity (e.g. uV/bit) and offset are stored using four parameters:
+ * digital maximum and minimum, and physical maximum and minimum.
+ * Here, digital means the raw data coming from a sensor or ADC. Physical means the units like uV.
+ * The sensitivity in units/bit is calculated as follows:
+ *
+ * units per bit = (physical max - physical min) / (digital max - digital min)
+ *
+ * The digital offset is calculated as follows:
+ *
+ * offset = (physical max / units per bit) - digital max
+ *
+ * For a better explanation about the relation between digital data and physical data,
+ * read the document "Coding Schemes Used with Data Converters" (PDF):
+ *
+ * http://www.ti.com/general/docs/lit/getliterature.tsp?baseLiteratureNumber=sbaa042
+ *
+ */
+
 
 struct edf_param_struct{         /* this structure contains all the relevant EDF-signal parameters of one signal */
   char   label[17];              /* label (name) of the signal, null-terminated string */
@@ -372,7 +395,7 @@ int edf_set_transducer(int handle, int edfsignal, const char *transducer);
 
 int edf_set_physical_dimension(int handle, int edfsignal, const char *phys_dim);
 
-/* Sets the physical dimension of signal edfsignal. ("uV", "BPM", "mA", "Degr.", etc.) */
+/* Sets the physical dimension (unit) of signal edfsignal. ("uV", "BPM", "mA", "Degr.", etc.) */
 /* phys_dim is a pointer to a NULL-terminated ASCII-string containing the physical dimension of the signal edfsignal */
 /* Returns 0 on success, otherwise -1 */
 /* This function is recommanded for every signal when you want to write a file */
diff --git a/global.h b/global.h
index dd25b0d..591c3b4 100644
--- a/global.h
+++ b/global.h
@@ -3,7 +3,7 @@
 *
 * Author: Teunis van Beelen
 *
-* Copyright (C) 2015, 2016, 2017 Teunis van Beelen
+* Copyright (C) 2015, 2016, 2017, 2018 Teunis van Beelen
 *
 * Email: teuniz@gmail.com
 *
@@ -35,7 +35,7 @@
 
 
 #define PROGRAM_NAME          "DSRemote"
-#define PROGRAM_VERSION       "0.35_1712291053"
+#define PROGRAM_VERSION       "0.35_1801021833"
 
 #define MAX_PATHLEN            4096
 
diff --git a/interface.cpp b/interface.cpp
index 7a193ca..a7e8a4b 100644
--- a/interface.cpp
+++ b/interface.cpp
@@ -3,7 +3,7 @@
 *
 * Author: Teunis van Beelen
 *
-* Copyright (C) 2015, 2016, 2017 Teunis van Beelen
+* Copyright (C) 2015, 2016, 2017, 2018 Teunis van Beelen
 *
 * Email: teuniz@gmail.com
 *
diff --git a/lan_connect_thread.cpp b/lan_connect_thread.cpp
index ad95895..11bfdef 100644
--- a/lan_connect_thread.cpp
+++ b/lan_connect_thread.cpp
@@ -3,7 +3,7 @@
 *
 * Author: Teunis van Beelen
 *
-* Copyright (C) 2016, 2017 Teunis van Beelen
+* Copyright (C) 2016, 2017, 2018 Teunis van Beelen
 *
 * Email: teuniz@gmail.com
 *
diff --git a/lan_connect_thread.h b/lan_connect_thread.h
index 0465405..3eeba44 100644
--- a/lan_connect_thread.h
+++ b/lan_connect_thread.h
@@ -3,7 +3,7 @@
 *
 * Author: Teunis van Beelen
 *
-* Copyright (C) 2016, 2017 Teunis van Beelen
+* Copyright (C) 2016, 2017, 2018 Teunis van Beelen
 *
 * Email: teuniz@gmail.com
 *
diff --git a/main.cpp b/main.cpp
index 1bb6e3b..22840d4 100644
--- a/main.cpp
+++ b/main.cpp
@@ -9,7 +9,7 @@ int main(int argc, char *argv[])
 {
   QApplication app(argc, argv);
 
-  app.setAttribute(Qt::AA_DontUseNativeMenuBar);
+//  app.setAttribute(Qt::AA_DontUseNativeMenuBar);
 
   class UI_Mainwindow MainWindow;
 
diff --git a/mainwindow.cpp b/mainwindow.cpp
index b037061..cc11026 100644
--- a/mainwindow.cpp
+++ b/mainwindow.cpp
@@ -3,7 +3,7 @@
 *
 * Author: Teunis van Beelen
 *
-* Copyright (C) 2015, 2016, 2017 Teunis van Beelen
+* Copyright (C) 2015, 2016, 2017, 2018 Teunis van Beelen
 *
 * Email: teuniz@gmail.com
 *
diff --git a/mainwindow.h b/mainwindow.h
index 50989fa..3ebd770 100644
--- a/mainwindow.h
+++ b/mainwindow.h
@@ -3,7 +3,7 @@
 *
 * Author: Teunis van Beelen
 *
-* Copyright (C) 2015, 2016, 2017 Teunis van Beelen
+* Copyright (C) 2015, 2016, 2017, 2018 Teunis van Beelen
 *
 * Email: teuniz@gmail.com
 *
diff --git a/mainwindow_constr.cpp b/mainwindow_constr.cpp
index b7ab13b..9baca02 100644
--- a/mainwindow_constr.cpp
+++ b/mainwindow_constr.cpp
@@ -3,7 +3,7 @@
 *
 * Author: Teunis van Beelen
 *
-* Copyright (C) 2015, 2016, 2017 Teunis van Beelen
+* Copyright (C) 2015, 2016, 2017, 2018 Teunis van Beelen
 *
 * Email: teuniz@gmail.com
 *
diff --git a/playback_dialog.cpp b/playback_dialog.cpp
index e3f930e..17856d1 100644
--- a/playback_dialog.cpp
+++ b/playback_dialog.cpp
@@ -3,7 +3,7 @@
 *
 * Author: Teunis van Beelen
 *
-* Copyright (C) 2017 Teunis van Beelen
+* Copyright (C) 2017, 2018 Teunis van Beelen
 *
 * Email: teuniz@gmail.com
 *
diff --git a/playback_dialog.h b/playback_dialog.h
index 5b4c5e3..4b7b9c9 100644
--- a/playback_dialog.h
+++ b/playback_dialog.h
@@ -3,7 +3,7 @@
 *
 * Author: Teunis van Beelen
 *
-* Copyright (C) 2017 Teunis van Beelen
+* Copyright (C) 2017, 2018 Teunis van Beelen
 *
 * Email: teuniz@gmail.com
 *
diff --git a/read_settings_thread.cpp b/read_settings_thread.cpp
index 2708d9c..4f1268c 100644
--- a/read_settings_thread.cpp
+++ b/read_settings_thread.cpp
@@ -3,7 +3,7 @@
 *
 * Author: Teunis van Beelen
 *
-* Copyright (C) 2016, 2017 Teunis van Beelen
+* Copyright (C) 2016, 2017, 2018 Teunis van Beelen
 *
 * Email: teuniz@gmail.com
 *
diff --git a/read_settings_thread.h b/read_settings_thread.h
index 52f7060..655cf36 100644
--- a/read_settings_thread.h
+++ b/read_settings_thread.h
@@ -3,7 +3,7 @@
 *
 * Author: Teunis van Beelen
 *
-* Copyright (C) 2016, 2017 Teunis van Beelen
+* Copyright (C) 2016, 2017, 2018 Teunis van Beelen
 *
 * Email: teuniz@gmail.com
 *
diff --git a/save_data.cpp b/save_data.cpp
index 5fc15ec..a043131 100644
--- a/save_data.cpp
+++ b/save_data.cpp
@@ -3,7 +3,7 @@
 *
 * Author: Teunis van Beelen
 *
-* Copyright (C) 2015, 2016, 2017 Teunis van Beelen
+* Copyright (C) 2015, 2016, 2017, 2018 Teunis van Beelen
 *
 * Email: teuniz@gmail.com
 *
diff --git a/save_data_thread.cpp b/save_data_thread.cpp
index e33ce1d..ac34475 100644
--- a/save_data_thread.cpp
+++ b/save_data_thread.cpp
@@ -3,7 +3,7 @@
 *
 * Author: Teunis van Beelen
 *
-* Copyright (C) 2015, 2016, 2017 Teunis van Beelen
+* Copyright (C) 2015, 2016, 2017, 2018 Teunis van Beelen
 *
 * Email: teuniz@gmail.com
 *
diff --git a/save_data_thread.h b/save_data_thread.h
index 2681304..825f348 100644
--- a/save_data_thread.h
+++ b/save_data_thread.h
@@ -3,7 +3,7 @@
 *
 * Author: Teunis van Beelen
 *
-* Copyright (C) 2016, 2017 Teunis van Beelen
+* Copyright (C) 2016, 2017, 2018 Teunis van Beelen
 *
 * Email: teuniz@gmail.com
 *
diff --git a/screen_thread.cpp b/screen_thread.cpp
index bb2a933..9f45d49 100644
--- a/screen_thread.cpp
+++ b/screen_thread.cpp
@@ -3,7 +3,7 @@
 *
 * Author: Teunis van Beelen
 *
-* Copyright (C) 2015, 2016, 2017 Teunis van Beelen
+* Copyright (C) 2015, 2016, 2017, 2018 Teunis van Beelen
 *
 * Email: teuniz@gmail.com
 *
diff --git a/screen_thread.h b/screen_thread.h
index e6a0db1..3568207 100644
--- a/screen_thread.h
+++ b/screen_thread.h
@@ -3,7 +3,7 @@
 *
 * Author: Teunis van Beelen
 *
-* Copyright (C) 2015, 2016, 2017 Teunis van Beelen
+* Copyright (C) 2015, 2016, 2017, 2018 Teunis van Beelen
 *
 * Email: teuniz@gmail.com
 *
diff --git a/serial_decoder.cpp b/serial_decoder.cpp
index 8f0c529..cb9e7a2 100644
--- a/serial_decoder.cpp
+++ b/serial_decoder.cpp
@@ -3,7 +3,7 @@
 *
 * Author: Teunis van Beelen
 *
-* Copyright (C) 2016, 2017 Teunis van Beelen
+* Copyright (C) 2016, 2017, 2018 Teunis van Beelen
 *
 * Email: teuniz@gmail.com
 *
diff --git a/settings_dialog.cpp b/settings_dialog.cpp
index 9e43bc1..0da8267 100644
--- a/settings_dialog.cpp
+++ b/settings_dialog.cpp
@@ -3,7 +3,7 @@
 *
 * Author: Teunis van Beelen
 *
-* Copyright (C) 2015, 2016, 2017 Teunis van Beelen
+* Copyright (C) 2015, 2016, 2017, 2018 Teunis van Beelen
 *
 * Email: teuniz@gmail.com
 *
diff --git a/settings_dialog.h b/settings_dialog.h
index ce1e45d..9a9fe98 100644
--- a/settings_dialog.h
+++ b/settings_dialog.h
@@ -3,7 +3,7 @@
 *
 * Author: Teunis van Beelen
 *
-* Copyright (C) 2015, 2016, 2017 Teunis van Beelen
+* Copyright (C) 2015, 2016, 2017, 2018 Teunis van Beelen
 *
 * Email: teuniz@gmail.com
 *
diff --git a/signalcurve.cpp b/signalcurve.cpp
index 0dc0a4c..593951e 100644
--- a/signalcurve.cpp
+++ b/signalcurve.cpp
@@ -3,7 +3,7 @@
 *
 * Author: Teunis van Beelen
 *
-* Copyright (C) 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017 Teunis van Beelen
+* Copyright (C) 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018 Teunis van Beelen
 *
 * Email: teuniz@gmail.com
 *
diff --git a/signalcurve.h b/signalcurve.h
index 4d0c186..829dcfc 100644
--- a/signalcurve.h
+++ b/signalcurve.h
@@ -3,7 +3,7 @@
 *
 * Author: Teunis van Beelen
 *
-* Copyright (C) 2015, 2016, 2017 Teunis van Beelen
+* Copyright (C) 2015, 2016, 2017, 2018 Teunis van Beelen
 *
 * Email: teuniz@gmail.com
 *
diff --git a/tdial.cpp b/tdial.cpp
index 829f9c9..d37da1b 100644
--- a/tdial.cpp
+++ b/tdial.cpp
@@ -3,7 +3,7 @@
 *
 * Author: Teunis van Beelen
 *
-* Copyright (C) 2016, 2017 Teunis van Beelen
+* Copyright (C) 2016, 2017, 2018 Teunis van Beelen
 *
 * Email: teuniz@gmail.com
 *
diff --git a/tdial.h b/tdial.h
index d9e4504..923a6db 100644
--- a/tdial.h
+++ b/tdial.h
@@ -3,7 +3,7 @@
 *
 * Author: Teunis van Beelen
 *
-* Copyright (C) 2016, 2017 Teunis van Beelen
+* Copyright (C) 2016, 2017, 2018 Teunis van Beelen
 *
 * Email: teuniz@gmail.com
 *
diff --git a/timer_handlers.cpp b/timer_handlers.cpp
index 07e7183..ae9ab74 100644
--- a/timer_handlers.cpp
+++ b/timer_handlers.cpp
@@ -3,7 +3,7 @@
 *
 * Author: Teunis van Beelen
 *
-* Copyright (C) 2015, 2016, 2017 Teunis van Beelen
+* Copyright (C) 2015, 2016, 2017, 2018 Teunis van Beelen
 *
 * Email: teuniz@gmail.com
 *
diff --git a/tled.cpp b/tled.cpp
index f8280ae..28af59f 100644
--- a/tled.cpp
+++ b/tled.cpp
@@ -3,7 +3,7 @@
 *
 * Author: Teunis van Beelen
 *
-* Copyright (C) 2014, 2015, 2016, 2017 Teunis van Beelen
+* Copyright (C) 2014, 2015, 2016, 2017, 2018 Teunis van Beelen
 *
 * Email: teuniz@gmail.com
 *
diff --git a/tled.h b/tled.h
index a26dd19..b4a7b5c 100644
--- a/tled.h
+++ b/tled.h
@@ -3,7 +3,7 @@
 *
 * Author: Teunis van Beelen
 *
-* Copyright (C) 2014, 2015, 2016, 2017 Teunis van Beelen
+* Copyright (C) 2014, 2015, 2016, 2017, 2018 Teunis van Beelen
 *
 * Email: teuniz@gmail.com
 *
diff --git a/tmc_dev.c b/tmc_dev.c
index b11315d..df314a7 100644
--- a/tmc_dev.c
+++ b/tmc_dev.c
@@ -3,7 +3,7 @@
 *
 * Author: Teunis van Beelen
 *
-* Copyright (C) 2015, 2016, 2017 Teunis van Beelen
+* Copyright (C) 2015, 2016, 2017, 2018 Teunis van Beelen
 *
 * Email: teuniz@gmail.com
 *
diff --git a/tmc_dev.h b/tmc_dev.h
index 8e89101..22e5504 100644
--- a/tmc_dev.h
+++ b/tmc_dev.h
@@ -3,7 +3,7 @@
 *
 * Author: Teunis van Beelen
 *
-* Copyright (C) 2015, 2016, 2017 Teunis van Beelen
+* Copyright (C) 2015, 2016, 2017, 2018 Teunis van Beelen
 *
 * Email: teuniz@gmail.com
 *
diff --git a/tmc_lan.c b/tmc_lan.c
index 4b8e28a..ec87eb2 100644
--- a/tmc_lan.c
+++ b/tmc_lan.c
@@ -3,7 +3,7 @@
 *
 * Author: Teunis van Beelen
 *
-* Copyright (C) 2015, 2016, 2017 Teunis van Beelen
+* Copyright (C) 2015, 2016, 2017, 2018 Teunis van Beelen
 *
 * Email: teuniz@gmail.com
 *
diff --git a/tmc_lan.h b/tmc_lan.h
index 2fdef3e..cc673a8 100644
--- a/tmc_lan.h
+++ b/tmc_lan.h
@@ -3,7 +3,7 @@
 *
 * Author: Teunis van Beelen
 *
-* Copyright (C) 2015, 2016, 2017 Teunis van Beelen
+* Copyright (C) 2015, 2016, 2017, 2018 Teunis van Beelen
 *
 * Email: teuniz@gmail.com
 *
diff --git a/utils.c b/utils.c
index 64dd691..a058c06 100644
--- a/utils.c
+++ b/utils.c
@@ -3,7 +3,7 @@
 *
 * Author: Teunis van Beelen
 *
-* Copyright (C) 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017 Teunis van Beelen
+* Copyright (C) 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018 Teunis van Beelen
 *
 * Email: teuniz@gmail.com
 *
diff --git a/utils.h b/utils.h
index 311baea..3bee05f 100644
--- a/utils.h
+++ b/utils.h
@@ -3,7 +3,7 @@
 *
 * Author: Teunis van Beelen
 *
-* Copyright (C) 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017 Teunis van Beelen
+* Copyright (C) 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018 Teunis van Beelen
 *
 * Email: teuniz@gmail.com
 *
diff --git a/wave_dialog.cpp b/wave_dialog.cpp
index 3cbc2d8..7c545b7 100644
--- a/wave_dialog.cpp
+++ b/wave_dialog.cpp
@@ -3,7 +3,7 @@
 *
 * Author: Teunis van Beelen
 *
-* Copyright (C) 2016, 2017 Teunis van Beelen
+* Copyright (C) 2016, 2017, 2018 Teunis van Beelen
 *
 * Email: teuniz@gmail.com
 *
diff --git a/wave_dialog.h b/wave_dialog.h
index be37201..0c7934b 100644
--- a/wave_dialog.h
+++ b/wave_dialog.h
@@ -3,7 +3,7 @@
 *
 * Author: Teunis van Beelen
 *
-* Copyright (C) 2016, 2017 Teunis van Beelen
+* Copyright (C) 2016, 2017, 2018 Teunis van Beelen
 *
 * Email: teuniz@gmail.com
 *
diff --git a/wave_view.cpp b/wave_view.cpp
index e8329ee..bc18184 100644
--- a/wave_view.cpp
+++ b/wave_view.cpp
@@ -3,7 +3,7 @@
 *
 * Author: Teunis van Beelen
 *
-* Copyright (C) 2016, 2017 Teunis van Beelen
+* Copyright (C) 2016, 2017, 2018 Teunis van Beelen
 *
 * Email: teuniz@gmail.com
 *
diff --git a/wave_view.h b/wave_view.h
index 1b2f32e..a4bb885 100644
--- a/wave_view.h
+++ b/wave_view.h
@@ -3,7 +3,7 @@
 *
 * Author: Teunis van Beelen
 *
-* Copyright (C) 2016, 2017 Teunis van Beelen
+* Copyright (C) 2016, 2017, 2018 Teunis van Beelen
 *
 * Email: teuniz@gmail.com
 *