Beautiful but not dumb, "miss tone" talking mannequin, carries on a lively chatter at the business show of the Boston chapter of National Association cost accountants at horticultural hall Wednesday and Thursday. With hair hat looks like spun gold, eyes of poetic beauty and a figure that is literally out of his world, "miss tone" is made of plastic and is wired for sound. To carry out the life like appearance, her eyes and lips move as she explains the virtues of the Executone communication system which is being exhibited at the show.