In a recent thread regarding the soon-to-be-released (🤞) XP Deus 2, the value of the ML Eqinonox's adjustable ground setting (whether manual or automatic) was brought up. (That was initiated by an XP video showing that multifrequency detector's ground balancing procedure.)
When the Equinox was released 3 1/2 years ago I specifically asked if the default setting of 0 had some special value, such as putting the detector into a custom balancing routine. My recollection is that I was told 'no
It's simple, if you are hearing excessive ground noise (or in doubt if you have the ferrous bin discriminated), rebalance (pumping auto "ground grab"). There is nothing magic about zero and each mode may react with the ground differently meaning the balance number can vary depending on mode so the number, in and of itself is relatively meaningless and is not necessarily correlated to the degree of soil mineralization. Multi is just a little more forgiving on a less than optimal balance setting,