There’s no immediate telling if at the 2:26-minute point along the 10:57-long timeline of “C Drone,” when the higher-pitched, more sinuous drone emerges from a thicker, more burr-like drone, one of those in particular can be attributed to He Can Jog (aka Erik Schoster) and the other to Nomad Palace (aka Nate Zabriskie). It’s a duet, a collaboration, per the track’s title (Schoster inserts a “with Nomad Palace” parenthetical after the “C Drone”), but beyond that, little is made clear. Both musicians live in Milwaukee, Wisconsin, and are two thirds of the band Cedar AV (the missing piece being Nicholas Sanborn). They have plenty of collaborative performance experience between them, and thus the apparent parts within “C Drone” could just as likely be the result of their mutual efforts, not simply an expression of their simultaneous performance. Either way, it’s a strong piece. Schoster in his brief note calls it a “drone /not-drone,” which is apt — it’s more of a series of drones, from oh-so-quiet, to richly patterned, to a cicada frenzy, sewn into something that progress like a piece of program music.