“Providing the proper context for a baggage-heavy project like Portastatic is tricky, especially without launching into some kind of perverse, indie rock version of *The $10,000 Pyramid*, twitching in a plastic seat and frantically hollering buzzwords: Superchunk frontman! Co-owner of Merge Records! Tropicalia! Chapel Hill! Canadian film soundtrack! Yo La Tengo! But the peripheral associations that”