drones buzzes buzzing hums purrs hummings sighs murmurations whispers mutterings rumbles whisperings babble grumbles mumbles mutters rumour rumor undertones murmurs murmurings sighings grunts gruntings asides rustles swishes whooshes hisses moans whirs rustlings whistle whizzes rushings sizzle fizz roars breathes blows fans burrs croons whirrs vibrates burbles bumbles sounds purls drawls zips strums whines zooms thrums crackles crinkles taps patters stirs swirls groans grieves sobs cries howls laments mourns sorrows