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@@ -22,6 +22,38 @@ http://www.gaudi.ch/OpenTheremin/
 4. Select the correct arduino board from Tools -> Board
 5. Upload the code by clicking on the upload button.
 
+### Added and removed compare to Open Theremin V3. 
+Serial communication implemented for programm monitoring purpose was removed (Particularly during calibration).
+If you need to monitor calibration for antenna problem fixing, please use original master branch from 
+https://github.com/GaudiLabs/OpenTheremin_V3
+Serial port is used to send midi messages now. 
+
+### How does it works ? 
+PITCH : 
+It uses first note detected at volume rise to generate a NOTEON. 
+Then it uses PITCHBEND to reach pitch as long as pitch bend range will do. 
+Beyond it generates a new NOTEON  followed by a NOTEOFF for the previous note (legato). 
+Pitch bend range can be configured (1, 7, 12 or 24 semitones - One exception is that I desactivated pitch bend in 1 semitone mode because portamento does a better job then). 
+
+VOLUME: 
+It generates VOLUME continuous controler, starting NOTEON and ending NOTE OFF (when playing stacato). 
+The trigger volume can be configured so as we have some volume at note attack on percussive sounds. 
+
+CONFIGURATION: 
+There is two calibration mode. 
+If REGISTER POT turned counter clockwise at entering in calibration mode -> Runs normal calibration of antennas
+If REGISTER POT turned clockwise at entering in calibration mode -> Records midi settings as per pot position BEFORE entering in calibration mode: 
+  VOLUME POT : sets volume trigger level
+  PITCH POT : sets pitch bend range (1, 7, 12 or 24 semitones)
+  TIMBRE POT : sets Channel. In the absence of graduation, timbre variation may help (Wave Form 1 low = CH1, WF 1 High = CH2, WF 2 Low = CH3, etc...)
+
+MUTE BUTTON: 
+Sends ALL NOTE OFF on selected channel and stay in mute until it's pushed again.  
+
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 ### LICENSE
 Written by Urs Gaudenz, GaudiLabs, 2016
 GNU license, check LICENSE file for more information