Scott Hansen’s fourth album, 2014’s Awake, bloomed like a black-and-white film into vivid technicolor: Joined by a live drummer and guitarist, the California instrumentalist expanded his drowsy electronica with shades of chiming post-rock – like Boards of Canada outfitted with U2’s organic stadium catharsis. The only downside was variety: Once you heard one melancholy groove, you essentially heard them all. Hansen remedies that problem with Epoch, which explores a wider range of instrumental quirks on a broader canvas of moods. There are forays into throbbing, festival-friendly EDM (“Horizon”) and electro-prog (“Slack,” set in a menacing 7/8 time). And while those Edge-styled lead guitars still carry the melodic weight, Tycho’s rhythm section is more vital this time around, from the staccato bass pulses of “Glider” to the jittery, jazzy drum fills of “Division.” Like its predecessor, Epoch fizzles out at the finish line, lumping a pair of sleepy should-have-been-interludes (ambient synth piece “Continuum,” guitar reverb showcase “Field”) back-to-back. Despite its anti-climactic sequencing, Hansen’s latest LP still probes deeper than his previous work, triggering as much angst as bittersweet introspection.