Our first exposure to the “numbers stations” transmissions — codes that have been broadcast on shortwave radio in a variety of languages since the 1940s — was on Wilco’s Yankee Hotel Foxtrot (2001). The sample, taken from The Conet Project: Recordings of Shortwave Numbers Stations (1997), was a labor of love captured and cataloged by aural obsessive Akin Fernandez (Fernandez’ collection can be downloaded for free at archive.org/details/ird059). As of yet unexplained and unrelenting, these strings of code continue to leach into the public sphere — in episodes of Fringe, in ambitious one-off performances by the Kronos Quartet, in James Cameron movies. Now San Francisco’s own remarkable Gino Robair is tackling the sonic mind-worms. His one-act opera, Neither Confirmed Nor Denied, places performers on four separate floors of a gallery where they will draw on a unique set of instructions — Robair’s version of a one-time pad — to translate numbers and words into music and movement, essentially decoding Robair’s libretto and score in real time. Your experience will vary, depending on which character/numbers station you visit. And it will probably haunt you.