Iwill give you my custom settings these work really well for me. When I first got my Max there was a lot of chatter in Pro Zero mode, I did not like Audio, and the same tones for low, high and mid tones, and especially having to watch the VDI numbers. Of course, keep all this in mind I had grown very use to my AT-Pro I could tell exactly from the different tones that what the coil was over was a quarter, dime, penny etc.
Discrimination 30
Notch out the following VDI 40, 55, 60 & 65
Sensitivity 2-3 bars back from full.
Set volume on max on the detector, adjust volume using headphones.
I do not use the threshold setting I keep my setting set on zero.
With the above numbers notched out I still pick up gold rings and etc. that are in the low tone area.
Again, this is what works for me, best advice I can give you are anyone using the Max read the manual front to back and back to front. Watch instruction videos, and do what you did here get advice from other users.
Good Luck and Happy Hunting. One other thing I suggest getting the Nel Sharpshooter 9.5 x 5.5 or the Garrett 5 x 8 coil, using either one of these coils you will never go back to the stock. My prefrence is the Nel I think it's much better coil.
Hal