Of all the different brand and model detectors I've used the Barons are the one I like most, especially the A&S/Cobra II models and Goldtrax. They're not as deep as the Cointrax versions, but in my mild ground they're deep enough. The photo below is a Goldtrax, but you can see it has a knob labeled "Set for tone ID". All the baseboard versions have that feature. You can set the audio to change from a low tone to a high tone just about anywhere in the disc range, plus they give a mixed high/low tone at the point it's set. I normally set mine to give low tones on nickels and foil, mixed tones on tabs and high tone on pennies, dimes and higher coins. When hunting only coins the notch on the A&S/Cobra II/Viper models can be set to give a low tone on nickel range targets, high tone on copper pennies and higher coins and no signal on everything else. They do have modulated audio. Higher coins at the edge of their depth capability give a high tone "tink". I've used a lot of detectors with tones, but that little high tone "tink" the analog Barons give on deep coins is my favorite sound.