I had my vista gold out for the first time in a bare bean field. I started with the switch in single tone, then two tone, and finally in all metal, boost off in all modes. I then put it in all metal, and boost on to get the deepest sounds and I did hear targets deeper with a high tone I then switched to two tone, and the targets were still high tone figuring it was a good target. I then switched off the boost, and the tone instantly went to a low iron tone. Is that normal.