He squeaks, he squawks, he clicks, he clacks, he creaks, he groans, he moans. That's not the point. Old guys with worse voices have sang better--Champion Jack Dupree prevailed in his 80s because he didn't stake his manhood on the technical impeccability of his instrument. For decades Sinatra's sound was magnificent, spellbinding, beyond reproach. Now, although he still sings better than the likes of Bono and Carly Simon, Luther Vandross runs rings around him the vocal department while Liza Minnelli out-acts him. Lesson learned: He who lives by the larynx dies by the larynx. C