“When Posse remark that their sound is inspired by “Delay pedals and 27 years of disappointment,” it’s meant to be a little funny, but also, not: a glimmer of humor shining out from a mountain of shit. That little shine can be enough, even if it’s surrounded by a day-to-day life of putting up with the most banal people performing the most banal actions. On “Shut Up,” from the Seattle trio’s Soft Op”