“Shhh”is just a gentle, two-dimensional field of echoing little padded sonic objects. It’s composed of small, soft sound trinkets that bound off of each other, sometimes on their lonesome, at other times in small groups. It’s like hearing a xylophone being played by snowflakes. The musician who recorded “Shhh” is hi.mo, aka Aimo Scampa of Torreano, Italy. You listen in “Shhh” for the patterns in the echoes and repeats, for which tones actually result in other tones, and to what extent the seeming slow-motion chaos is less a matter of interaction and more a matter of casually accumulating density.