From Jaros's Link above:
AUDIO DISCRIMINATION
The SDC 2300 gold detector audio response provides discrimination in the form of pitch and tone when the coil passes over ferrous or non-ferrous targets, similarly with amplitude and duration for shallow and deep targets. A louder, shorter sound will indicate a shallow target while a quieter, broader sound will indicate the presence of a deep, large target. A target that sounds off multiple times each swing will invariably be a near-surface or surface target.
I don't use a 2300, ( use a Z)wondered if this is a new function or was on the original 2300 eg. "A louder, shorter sound will indicate a shallow target etc " Its not in Redfins update onfo.
Peter