By Bill Meredith Seventy-one-year-old Brooklyn-born keyboardist/producer Jason Miles has charted an impressive recording career that includes credits with Miles Davis, Luther Vandross, and David Sanborn. And it’s all documented in his new autobiography, The Extraordinary Journey of Jason Miles. His interactions with these artists and others—an early chapter recounts crossing paths with Michael Brecker at a New York sushi restaurant and helping him buy a synthesizer in 1984—are highlights throughout. Yet there are also clues, like that chapter’s quote of “I always thought that I was ahead of ev…