High-frequency squeak, hum: Listen & Download High-frequency squeak, hum .mp3 Error! Change your browser, please! ⇓ Download Metronome ⚠ Ice crushing ⚠ Beads and balls crumble ⚠ Turning off the laser sword ⚠ Bath, Cork in the sink ⚠ The noise of the great hall ⚠ Bleeding a bike wheel ⚠ Servo motor ⚠ Old bike ⚠ Sine wave (975Hz) ⚠ Plate (fx) ⚠ Throw nutshells on the floor ⚠ ★★★★★