Last Sunday, somewhere on Kauai, an Internet signal beamed from a modest rural residence. The source, 36-year-old Bolinas-based musician Emma Lee, sat smiling and chatting into her computer, a lit cigarette at hand. Lee, whose band, the Emma Lee Project, recently released its first album, Waiting for Javi, is on an extended vacation. But she is not using the opportunity as an excuse to fall behind on promoting her band. Thanks to the Web and…