工业矿石开采机循环

Seamless looping industrial ore mining machine loop, two seconds that loops perfectly. A steady gritty mechanical grind: a 140 Hz motor body, a dense crunchy band-passed granulate around 1.2 kHz as rock and ore are bitten away, and a faint 5 Hz chug from the drill head. Dry, close, machine-like, unobtrusive. No reverb, no musical pitch, no melody, no fade at the loop point.