What’s left for a microsound experimentalist with ambient tendencies? Thankfully, more of the same: producer Dan Abrams’s third Shuttle358 album, Understanding Wildlife, brims with the same longish bell tones that define all his work, but avoids emphasizing the absence of sound as he did on his Frame and eponymous Stream releases, on which he used field recordings made by The Quiet American. Instead, the album starts with a bouquet of colorless tones on “Finch,” then quickly moves into legato pulse rhythms in “Plastination” and a quaint balance of bass-signal and lulling treble melody on “I’m Not Afraid.” Understanding Wildlife suggests that measured progression is one of Dan Abrams’s greatest pleasures.