buzz, thrum, seethe, hummer, murmuring, thrumb, drone, zing, muttering, croon, more...

silence, quiet, hush, stillness, mute

buzz, ring, buzz-hum, buzz-ring, buzz-hum-buzz, more...

low, busy, steady, faint, distant, loud, soft, constant, deep, drowsy, quiet

whirring sound,   quiet noise,   humming sound,   droning noise,   buzzing sound,   buzz sound,   humming sounds,   buzzing noise,   drone out,   hmm noise