listen : a machine-gun rattle of silver coins as they tumble and spurt down into a slot machine tray and overflow onto monogrammed carpets is replaced by the siren clangor of the slots , the jangling , blippeting chorus swallowed by the huge room , muted to a comforting background chatter by the time one reaches the card tables , the distant sounds only loud enough to keep the adrenaline flowing through the gamblers veins .