CODA 8 V1

Just bought a used Coda 8 V1   Wow am I impressed. Could someone answer a question that the instructions don't address, or I missed it.  It has to do with the meter lights. I'm sure it has to do with the sensitivity of the meters. They give you an option of pressing the button ( on each side)  to give you a green light or an orange light,  flanking it on either side is a bright blue light that indicates the unit is operating correctly.  Could someone just clarify what the pressing of the button does, whether choosing green or orange? thanks so much!!! What a great amp!!!!!! Robert Tn