This is a good question. New to the hobby, I'll answer it like this..........I think we can all agree that you can't trust a detector's bells and whistles 100% of the time right? With that said, there will be things in the ground that you can dig or not, and possibly miss something you would've otherwise been happy digging up. On another note, taking into account that the bells and whistles will not be correct 100% of time, they neverthless are trying to tell you something. Anytime you begin to get Target ID's wether solid or bouncy ones, depth readings, steady or also bouncy, this is additional information that the detector is giving you beside the sounds. You can choose to play it by ear, but that would be ignoring data. If you can learn how a detector reacts to different targets/metals with the bells and whistles, then you have that additional data to make a decision about how to spend your time digging. As an example, I will share with you a technique that I learned very recently with the ACE 250 that I use. I have noticed that there are times when the target ID will jump between a dime and half dollar. As it does this, so does the depth readings. It will/would point to the dime at 4 inches and then jump to the half dollar ID at 6 inches. Bouncy iffy signal right? Not quite. I learned that by noticing at what depth that dime ID was reading (4 inches) as the depth and ID readings bounce back and forth, I could lower the sensitivity to keep out the interference from the other source that was causing the 1/2 dollar reading at 6 inches. I automatically knew that I was going over two targets, one deeper than the other. By lowering the sensitivity, I eliminated the deeper target and got/get a nice clean dime signal at 4". If I were just listening to the audio, I would've waved the signal off as a bad target, perhaps a bottle cap or crushed can. With what I said in mind, I would be against an all tone method of hunting. I say combine tone with panel.