Not sure what you mean by constant low pinging. You get little bips and tiny spits from odd bits of minerals and small iron stuff, but as a beginner I can't offer much. If there is constant chatter and tiny spits I think you may need to reduce sensitivity if you don't like it.
You will get little spits which is normal, I like to think of it as the Deus sniffing like a hound dog, I like it cos I know the machine is working hard. If your testing targets then you know what it's like when you hit a target.
Watch Gary's videos over and over, they teach you more than words can say.