Ambient techno comes in two forms. The first features steady, propulsive kick drums and mechanical disco hi-hats that are slathered in surface noise and field recordings. The second leans into the ambient, sounding more like one of those Environments CDs you’d listen to at a kiosk if you’re old enough to remember when malls existed; the sound of crashing waves or hissing cicadas occasionally interrupted by the steady thumpthumpthump heartbeat of a subtle beat. The Setting Sun, initially released in 2009 as the first record from Stephen Hitchell’s Variant project, goes even harder into the ambient, with nary a beat to be heard for almost two-thirds of its runtime. It’s a hypnotic, deeply immersive listen, meant mainly for opening third eyes and inner…