diff --git a/Config.h b/Config.h
index 3eb0ed4..156e850 100644
--- a/Config.h
+++ b/Config.h
@@ -27,7 +27,7 @@
 // Frequencies such as 10.0 Mhz (48000 * 208.333) or 20 Mhz (48000 * 416.666) are not suitable.
 //
 // For 12 MHz
-// #define EXTERNAL_OSC 12000000
+#define EXTERNAL_OSC 12000000
 // For 12.288 MHz
 // #define EXTERNAL_OSC 12288000
 // For 14.4 MHz
diff --git a/mmdvmmenu.sh b/mmdvmmenu.sh
index 5ed9413..b5f5ded 100755
--- a/mmdvmmenu.sh
+++ b/mmdvmmenu.sh
@@ -23,9 +23,9 @@
 ###############################################################################
 #
 # On a Linux based system, such as a Raspberry Pi, this script will perform
-# Modafacation to the Config.c file for most options. It makes a Back up when
-# you staet the script if none is present. You must recompile and load firmwhare
-# on Due if changes are made.
+# Modification of the Config.h file for most options. It makes a Back up when
+# you start the script if none is present. You must recompile and load firmware
+# onto the Arduino Due if changes are made.
 #
 ###############################################################################
 #
@@ -61,15 +61,16 @@ do
     --------------------------------------------------------------
     Please enter your choice:
 
-    (1) Enable 12.0 MHZ Clock
-    (2) Enable 14.4 MHz Clock
-    (3) Enable 19.2 MHz Clock
-    (4) Use the COS to lockout the modem
-    (5) Use pins to output the current mode
-    (6) Use layout for the PAPA board
-    (7) Use layout for ZUM V1.0 and V1.0.1 boards
-    (8) Use layout for SP8NTH board
-    (9) Use modem as display driver
+    (1) Enable 12.000 MHZ Clock
+    (2) Enable 12.288 MHZ Clock
+    (3) Enable 14.400 MHz Clock
+    (4) Enable 19.200 MHz Clock
+    (5) Use the COS to lockout the modem
+    (6) Use pins to output the current mode
+    (7) Use layout for the PAPA board
+    (8) Use layout for ZUM V1.0 and V1.0.1 boards
+    (9) Use layout for SP8NTH board
+    (0) Use modem as display driver
     (A) Return to Default
 
                          (Q)uit
@@ -77,15 +78,16 @@ do
 EOF
     read -n1 -s
     case "$REPLY" in
-    "1")  sed -e 's/\/\/ #define EXTERNAL_OSC 12000000/#define EXTERNAL_OSC 12000000/'     $conf > $conf.tmp && mv -f $conf.tmp $conf && echo "12.0 MHz clock enabled";;
-    "2")  sed -e 's/\/\/ #define EXTERNAL_OSC 14400000/#define EXTERNAL_OSC 14400000/'     $conf > $conf.tmp && mv -f $conf.tmp $conf && echo "14.4 MHz clock enabled";;
-    "3")  sed -e 's/\/\/ #define EXTERNAL_OSC 19200000/#define EXTERNAL_OSC 19200000/'     $conf > $conf.tmp && mv -f $conf.tmp $conf && echo "19.2 MHz clock enabled";;
-    "4")  sed -e 's/\/\/ #define USE_COS_AS_LOCKOUT /#define USE_COS_AS_LOCKOUT/'          $conf > $conf.tmp && mv -f $conf.tmp $conf && echo "COS as Lockout enabled";;
-    "5")  sed -e 's/\/\/ #define ARDUINO_MODE_PINS/#define ARDUINO_MODE_PINS/'             $conf > $conf.tmp && mv -f $conf.tmp $conf && echo "Mode pins Enabled";;
-    "6")  sed -e 's/\/\/ #define ARDUINO_DUE_PAPA/#define ARDUINO_DUE_PAPA/'               $conf > $conf.tmp && mv -f $conf.tmp $conf && echo "Layout for the PAPA board enabled";;
-    "7")  sed -e 's/\/\/ #define ARDUINO_DUE_ZUM_V10/#define ARDUINO_DUE_ZUM_V10/'         $conf > $conf.tmp && mv -f $conf.tmp $conf && echo "Layout for ZUM V1.0 and V1.0.1 boards enabled";;
-    "8")  sed -e 's/\/\/ #define ARDUINO_DUE_NTH/#define ARDUINO_DUE_NTH/'                 $conf > $conf.tmp && mv -f $conf.tmp $conf && echo "Layout for SP8NTH board enabled";;
-    "9")  sed -e 's/\/\/ #define SERIAL_REPEATER/#define SERIAL_REPEATER/'                 $conf > $conf.tmp && mv -f $conf.tmp $conf && echo "Modem display driver enabled";;
+    "1")  sed -e 's/\/\/ #define EXTERNAL_OSC 12000000/#define EXTERNAL_OSC 12000000/'     $conf > $conf.tmp && mv -f $conf.tmp $conf && echo "12.000 MHz clock enabled";;
+    "2")  sed -e 's/\/\/ #define EXTERNAL_OSC 12288000/#define EXTERNAL_OSC 12288000/'     $conf > $conf.tmp && mv -f $conf.tmp $conf && echo "12.288 MHz clock enabled";;
+    "3")  sed -e 's/\/\/ #define EXTERNAL_OSC 14400000/#define EXTERNAL_OSC 14400000/'     $conf > $conf.tmp && mv -f $conf.tmp $conf && echo "14.400 MHz clock enabled";;
+    "4")  sed -e 's/\/\/ #define EXTERNAL_OSC 19200000/#define EXTERNAL_OSC 19200000/'     $conf > $conf.tmp && mv -f $conf.tmp $conf && echo "19.200 MHz clock enabled";;
+    "5")  sed -e 's/\/\/ #define USE_COS_AS_LOCKOUT /#define USE_COS_AS_LOCKOUT/'          $conf > $conf.tmp && mv -f $conf.tmp $conf && echo "COS as Lockout enabled";;
+    "6")  sed -e 's/\/\/ #define ARDUINO_MODE_PINS/#define ARDUINO_MODE_PINS/'             $conf > $conf.tmp && mv -f $conf.tmp $conf && echo "Mode pins enabled";;
+    "7")  sed -e 's/\/\/ #define ARDUINO_DUE_PAPA/#define ARDUINO_DUE_PAPA/'               $conf > $conf.tmp && mv -f $conf.tmp $conf && echo "Layout for the PAPA board enabled";;
+    "8")  sed -e 's/\/\/ #define ARDUINO_DUE_ZUM_V10/#define ARDUINO_DUE_ZUM_V10/'         $conf > $conf.tmp && mv -f $conf.tmp $conf && echo "Layout for ZUM V1.0 and V1.0.1 boards enabled";;
+    "9")  sed -e 's/\/\/ #define ARDUINO_DUE_NTH/#define ARDUINO_DUE_NTH/'                 $conf > $conf.tmp && mv -f $conf.tmp $conf && echo "Layout for SP8NTH board enabled";;
+    "0")  sed -e 's/\/\/ #define SERIAL_REPEATER/#define SERIAL_REPEATER/'                 $conf > $conf.tmp && mv -f $conf.tmp $conf && echo "Modem display driver enabled";;
     "A")  mv -f $confbak $conf ;;
     "a")  mv -f $confbak $conf ;;
     "Q")  echo "If any changes are made you need to (re-)upload the firmware to MMDVM" && exit;;