Many of you have described a faint cat "purring" sound for deep targets where there is no VID on the control box. Well today I experienced it and was rewarded with an 1885 IH. It was approximately 6-7 inches deep which for our GA red clay is pretty deep. My settings were: Disc 6.8, Fulltones, Sens 95, Freq 18, Reactivity 3, Silencer -1, Audio Resp 5