After six years of purgatorial sway, Joel Shanahan's Auscultation project returns with a fourth full-length of dazzling, convex electronics: 'IV'. His signature production touches have only heightened in the interim: iridescent synths; dexterous bass; slinky networks of pads and percussion; regal, rolling fog. Icy bangers of isolation and beauty crafted over long Pacific Northwest winters of endless rain.