Hey Scott,
With the XS, I think you can either switch to only hearing one tone, or switch to hearing all of the tones. I think these are the only two choices you have.
Another way to eliminate tones is to use discrimination. If you reject all metals and then learn in silver coins, wheat cents, and indian heads, then you can hunt and the machine will allow only those tones (or tones similar to them) into your headphones.
Here's how some of the controls affect the tones:
Increasing the gain increases the amplification of faint-weak signals. It controls how loud the faint signals are.
Changing the threshold tone changes the pitch at which the constant threshhold tone droning at.
Changing variability changes how much difference there is between tones of different pitches. For example, if you lower the variability, iron will sound low, and aluminum will sound just a little higher. If you raise the variability, iron will sound even lower, and aluminum will sound even higher.
The limits settings takes your highest tones and makes them even higher for audio contrast between high tones.
The best thing to do is to find out what settings the experts use, set up your machine, and then do not change the settings. Spend a couple hundred hours learning the sounds these settings produce.
If you are in real trashy areas looking for gold, you might want to reject all metals and learn in pulltabs, and gold items only. No coins. Then you can go cruise around in the trashy areas. My buddy just started using the XS and he set up his machine by rejecting all metals, and then learning in only silver coins and pennies. Now he cruises around in any area (trashy or not trashy) and he is finding stuff and having a good time! He is probably missing coins but so what! He's having a great time! He is also learning what coins sound like because the XS is only giving him coin-like or actual coin sounds. Once he gets the feel for those sounds, then he can start reducing his amount of discrimination and start chasing the iffy signals.
Mike
