New York, '99. Jeff Beck walks on like a man who knows the secret to the universe and is keeping it to himself — no band, no fuss, just that sly grin and a guitar that's seen more action than most rock stars. The album Who Else! is hot off the presses, and he's here to show why he's still the boss. Jennifer Batten's alongside him, doubling the danger, but it's Beck's show all the way.He's playing a white Fender American Standard Stratocaster (alder body, maple neck, vintage-style single-coils —