Sonum Danica is a multi-year project mapping the Kingdom of Denmark through 433 sonic investigations and disruptions. The "land surveying equipment" observes the surroundings, locally amplifying sound to the feedback point with microphone and speaker. Notching suppresses dominant resonances, encouraging playful sound interactions among less prominent frequencies. Ritualistic acts create space for randomness; recording equipment documents measurements, plotted at www.sonumdanica.dk. For Struer Tracks, silence intensifies at a central location, where chance once again becomes an active participant in the auditory experience.