Call custom function inside void Setup?

this could be made into a 2D Array

and you could initialise everything statically instead of inside the setup()

byte safeDataAddr[][2] = {
  {0x69, 0x00},
  {0x60, 0x02},
  {0x60, 0x02},
  {0x60, 0x03},
  {0x60, 0x04},
};

// 2-byte address to send target address during a safe load.
byte safeTargetAddr[] = {0x60, 0x05};

 // 2-byte address to send number of words to write and trigger the safe load.
byte safeTrigAddr[] = {0x60, 0x06};

// Trigger safe load of 1 data word.
byte safeTrig1[] = {0x00, 0x00, 0x00, 0x01};

// 4-byte address of volume control.
byte volAddress[] = {0x00, 0x00, 0x00, 0x19}; 

I see a lot of 0x60 and successive numbers so wonder if the arrays are really needed