XP Metal Detectors Gmaxx II Instruction Manual - page 18
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M U L T I - T O N E
I N F O R M A T I O N S
In addition to these three basic tones, GMAXX II has another
advantageous feature : it can produce several different tones
simultaneously for targets in intermediate categories. Your ear will
eventually grow accustomed to this abundance of sounds.
Certain medium-sized ferrous masses that are usually hard to
identify are signaled by a simultaneous low/medium/high pitch
(except for very large ferrous masses, of course, which generate a
high pitch). It takes a little bit of practice to accustom your ear to
the various tones.