When using Quick Start the GPZ will reset to a fixed point set by software but every detector and coil combination is slightly different and also the temperature where you are operating will be different to were others are working. To reset the ferrite balance and Ground balance you need to select RESET ALL out of the two options, if you use Audio smoothing OFF you will need to go back into that menu option and reset as the default is Low, same goes for Threshold Pitch which is default 53. 
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