Synonyms and related words :
birdies, blooping, blurping, closed loop, closed sequence, current-control circuit, degeneration, distortion, flip-flop circuit, flutter, fluttering, hissing, howling, hum, motorboating, positive feedback, process loop, quality loop, reversed feedback, rumble, scratching, shredding, squeals, static, whistles, woomping, wow, wowwows