An adventurous electroacoustic artist working in the tradition of Terry Riley and Laurie Spiegel, Isaac Sherman combines the refracted glow of L.A.’s ambient jazz scene with more tactile synth excursions. Though adroit at loop-based synth improvisation, Sherman has turned to tighter structures and more definite rhythms for his first proper album. Though its name suggests a concern with boundaries and demarcations, A Pasture Its Limits finds ways to make the territory it stakes out feel expansive if not endless.