With tone ID, the pitch will vary up and down as the VDI goes up and down. I high pitch tone for high VDI. Mid pitch tone for mid range VDI and low pitch tone for low range VDI.
With that aside, using a single tone (no tone ID) getting the single tone clean and repeatable is reason for me to dig. If I sweep and continue sweeping at different angles, and get lots of good tone, dig. If it breaks up, nulls, not consistent most sweeps, then I'll pass unless I'm just in the mood and in no hurry and want to find out what it is. Then some machines are a single tone only so there are no other options. All my Tesoro's are single tone with the exception of the Cortes in the sum mode. So using the single tone can also have character, does the tone sound crisp, have a blip, crackle to it. Quality headphone helps me bring out the quality or lack of on that single tone. After awhile, that single tone can sound like a good target, or that sounds like a tab, or a screw cap, bottle cap. Nail tones one way and blips the other direction. Some of the Tesoro folks posted how it took them awhile before they started noticing some of the little differences they get even on a good clean consistent tone.
The V3 has tone and tone ID. If the tone ID is off, get a target that breaks up and not repeatable, then run the analyze display and see what it does. Then, in clean ground and a coin, check the single tone, then go to the analyze display.
With tone ID on, in clean ground, lay a quarter, dime, nickle and go over each. The quarter will have the highest tone with the highest VDI (I usually get 83,84) and the nickle (5c) will have the lowest. After awhile, the "that sounds like a nickle" can happen.
If you get into a bottle cap, the bottle cap rejection setting helps to break up the sound. They call it sputter I believe. The setting is from none "0" to 20. If you have to use bottle cap rejection, I would use the lowest setting as Whites recommends. If conditions are not favorable, then some good targets may not sound as clean.
Ah I'm rambling - try both the single tone and the tone ID turned on as suggested and give both a fair shake. Some prefer one over the other. Another option on the V3 is you can assign any available tone to any VDI. You can set it up as a 2, 3, 4, 5, 6, 7, etc tone machine buy assigning a specific range of VDI's to a tone. Like one tone for VDI 0 - 10, another for 11 - 20, another for 21 - 30 and on. It's just versatile for a variety of preferences. Makes it kind of fun too. All tired here - hope some made a little sense
