diff --git a/src/myeeprom.h b/src/myeeprom.h
index 43ad51669..3cb7de258 100644
--- a/src/myeeprom.h
+++ b/src/myeeprom.h
@@ -100,6 +100,12 @@ enum BeeperMode {
 #define EXTRA_ARM_FIELDS
 #endif
 
+enum AdcInput {
+  e_adc_single,
+  e_adc_osmp,
+  e_adc_filtered
+};
+
 #define ALTERNATE_VIEW 0x10
 PACK(typedef struct t_EEGeneral {
   uint8_t   myVers;
diff --git a/src/open9x.cpp b/src/open9x.cpp
index 4ae056e9d..ef69aec9d 100644
--- a/src/open9x.cpp
+++ b/src/open9x.cpp
@@ -2804,10 +2804,10 @@ int main(void)
     uint16_t t0 = getTmr16KHz();
 #endif
 
-    if (g_eeGeneral.filterInput == 1) {
+    if (g_eeGeneral.filterInput == e_adc_filtered) {
       getADC_filt() ;
     }
-    else if ( g_eeGeneral.filterInput == 2) {
+    else if ( g_eeGeneral.filterInput == e_adc_osmp) {
       getADC_osmp() ;
     }
     else {
diff --git a/util/tts.py b/util/tts.py
new file mode 100644
index 000000000..a00b0600b
--- /dev/null
+++ b/util/tts.py
@@ -0,0 +1,22 @@
+#!/usr/bin/env python
+
+import os, sys, shutil, platform, subprocess
+
+def generate(str, idx):
+    if platform.system() == "Windows":
+        subprocess.Popen(["C:\Program Files\eSpeak\command_line\espeak.exe", "-w", "%04d.wav" % idx, str], stdout=subprocess.PIPE, stderr=subprocess.PIPE).wait()
+        subprocess.Popen(["D:\Perso\workspace\companion9x\AD4CONVERTER.EXE", "-E4", "%04d.WAV" % idx], stdout=subprocess.PIPE, stderr=subprocess.PIPE).wait()       
+
+if __name__ == "__main__":
+    
+    if "en" in sys.argv:
+        for i in range(20):
+            generate(str(i), i)
+        for i in range(20, 100+1, 10):
+            generate(str(i), 20+(i-20)/10)
+        generate("1000", 29)
+        for i, s in enumerate(["hour", "hours", "minute", "minutes", "second", "seconds", "", "and", "minus"]):
+            generate(s, 40+i)
+        for i, s in enumerate(["volts", "amps", "meters per second", "", "km per hour", "meters", "degrees", "percent", "milliamps"]):
+            generate(s, 50+i)
+    
\ No newline at end of file