Support configuring the pitch range parameter.

android/res/values/strings.xml

   <string name="formatter_wpm">%s WPM</string>
   <string name="formatter_percentage">%s%%</string>
   <string name="resetToDefault">Set to default</string>
+  <string name="espeak_pitch_range">Pitch variation</string>
 </resources>

android/src/com/reecedunn/espeak/TtsService.java

         mEngine.setVoice(mMatchingVoice, null, gender, SpeechSynthesis.AGE_ANY);
         mEngine.Rate.setValue(rate, request.getSpeechRate());
         mEngine.Pitch.setValue(pitch, request.getPitch());
+        mEngine.PitchRange.setValue(getPreferenceValue("espeak_pitch_range", mEngine.PitchRange.getDefaultValue()));
         mEngine.Volume.setValue(getPreferenceValue("espeak_volume", mEngine.Volume.getDefaultValue()));
         mEngine.synthesize(text, text.startsWith("<speak"));
     }

android/src/com/reecedunn/espeak/TtsSettingsActivity.java

 
         group.addPreference(createPreference(context, engine.Rate, "espeak_rate", R.string.setting_default_rate));
         group.addPreference(createPreference(context, engine.Pitch, "espeak_pitch", R.string.setting_default_pitch));
+        group.addPreference(createPreference(context, engine.PitchRange, "espeak_pitch_range", R.string.espeak_pitch_range));
         group.addPreference(createPreference(context, engine.Volume, "espeak_volume", R.string.espeak_volume));
     }