Earlier this year, Detroit mainstay Scott Grooves launched a series of records in homage to the Roland gear crucial to the fertilization of techno. February brought the first installment, DeTRoit 808 — the best record I’ve heard all year. In its original version, “808” drew from both the retro novelty of its creation (produced on the titular analog drum machine) and the fluid funk streaming from Grooves’ mind. A technical demonstration from a producer of truly singular sensibilities, “808” was simply stunning. A pair of “Dub Delay” mixes, credited to Panther, teased a breaking-dawn mist from Grooves’ pads. Though Panther’s modifications owed little to what’s typically called “dub techno,” their bottomless-abyss echo and windswept textures were just what I hope for whenever I encounter the genre tag. The second installment (of a planned trilogy) takes on the twenty-five-year-old Roland 909.