How could play the square that crosses every day? This is one of the typical questions posed by the sound artists fascinated by urban spaces, developing different solutions of sounds that populate the usual areas of public transit or stopover, the common heritage of visual and sound. There are several jobs that have recently been developed by different authors and groups on these coordinates, as Hlemmur in C , Sound Mapping , Blue Moon and Transit Wellen , to which is added a new temporary installation, made ​​in the central Leidseplein in Amsterdam. Radioscape III , in fact, consists of 15 radio transmitters, each of which transmits its streaming sound independently. Made by Edwin van der Heide is received imbracando a receiver which allows to mix the different audio streams overlapping, whose presence and intensity is given by the proximity to the source of transmission. The work closely resembles the concept expressed several years ago by Frequency Clock of Radioqualia (layering audio contextual to the proximity of the sources) deducing that the same mechanism, but indoors and with computer ritrasmettevano that the signal coming from some net.radio. It appears, on the whole, the formulation of a need to expand the channels perceived by hearing, testing the recognition of the same auditory stimuli. A sort of need to increase access to sensory information, similar to what you can do on the network, and at the same time to be able to apply a filter to the ubiquitous reflective background data, sound this time.