I'm new to this type of detector and I was wondering...I'm finding every tool that us kids left in the yard 30 yrs ago.I haven't found and coinage as of yet....having trouble getting used to the different tones. The things that I've found have been as deep as 10-12" deep,which I guess is good.It tells me that it's got plenty of depth to it!!! I know you should dig everything...but I'd like to,for the time being,limit the depth to 4-6" Is there any way to adjust the freq.to limit it or is it all done with the discrimination? One other thing...does Garrett make an exterior speaker for this so a person didn't have to always wear the headphones? Thanks,jachuck49.