Throughout the ‘20s, records progressively became louder to take advantage of the proliferation of gramophones that had no volume knob. The phrase “put a sock in it” actually references cramming a sock into the horn of a gramophone to stifle the sound on louder recordings.
“I’m a bit foggy as to what jute is, but it’s apparently something the populace is pretty keen on…”
— Leave it to Jeeves, P.G. Wodehouse
^ google image search: “jute”
^ google image search: “burlap”