I had an Eagle Spectrum, and liked it a lot. After using it for several years, I finally clicked on "Tone ID". This gives a different sounding tone to different types of targets. Loved that feature! I could discern coins just by ear, and not have to look at the display. Now, I have an Equinox, and use "50 tones", which is about the same thing. If your SL has "Tone ID", try using it!