The "-0.2" could be changed into another value from "0" to "-0.5" depending on how good you are to reach center of the note that you play. "0" is for very good players. "-0.5" is very permissive and generates note toggling in 1 semitone mode. "-0.2" is the limit where my favourite chromatic tuner's green LED turns off (and it is OK for me).
### LICENSE
Original project written by Urs Gaudenz, GaudiLabs, 2016
GNU license. This Project inherits this 2016 GNU License.