@scratcher no problem mate. The easiest way is to just reallocate those pins. So find the bit in the code that looks like this and swap the values around like this...
int _tiggerPin = 7; // Label Pin to buttons
int _upPin = 11;
int _downPin = 13;
int _leftPin = 10;
int _rightPin = 12;
int _APin = A1;
int _BPin = A0;
int _startPin = A2;
int _selectPin = A3;
int _reloadPin = 9;
int _pedalPin = 5;
That will swap those function around. i.e down is now calibration and the old calibration button is now down.