With the tone control at a single touch, I can make Caruso sound like Hutch, wrote and sang Michael Flanders, and if you’re mother sounds as if she’s suddenly grown a beard next time you speak to her on the phone, don’t worry, its just Ma Bell hitching up her skirts and getting all skittish in her old age: AT&T Co yesterday announced MegaBass for the phone, so that suddenly when a company puts you on hold and plays you a pleasant snatch of Snow or Shabba Ranks, the beat will be heard right through the house; AT&T much more decorously calls it TrueVoice, and what it has done is to use signal processing technology to enhance the bass end of the telephone spectrum but apart from saying that it was developed at Bell Laboratories, wouldn’t explain how it worked; the company will progressively introduce it on calls in the US and Canada and it hopes it will give the eardrums of competitors a hammering.