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Jana Winderen researches the hidden depths with the latest technology; her work reveals the complexity and strangeness of the unseen world beneath. The audio topography of the oceans and the depth of ice crevasses are brought to the surface. She is concerned with finding and revealing sounds from hidden sources, both inaudible for the human senses and sounds from places and creatures difficult to access. For Deutschlandradio Kultur, Winderen has produced a new radio piece. Kunstradio presents “out of range” as part a “Listening Proposal” within the cooperation of the EBU’s Ars Acustica group for radio art. 'out of range' is an audio work based on ultrasound and echolocation used by bats, dolphins and other creatures who operate beyond the range of human hearing – 'seeing' with sound, or perhaps 'hearing' objects. Sound is invisible. Ultrasound is inaudible. Of course, many species have a greater range of hearing than us humans and also more specific and specialised with complex combinations of the different senses… Creatures on both land and under water produce and/or perceive very high sound frequencies. Some species of insects, birds, fish, and mammals can emit and hear ultrasound, which is used for communications, hunting and orientation. These creatures operate on a different level of perception to us, in an inaudible range above 20kHz. Many animals also use the acoustic properties of space; a bat, for example, can use the echo from a tower block to amplify their calls for mates in the autumn; toadfish use caves to amplify their calls to protect their habitat. Whales use the different acoustic properties at different depths of the ocean at different pressure levels to send their long distance calls. An astonishing fact about moths is that they have a reflex action using their wings to shut down when they hear a bat's echolocation calls… That we think this to be astonishing, does that say something about us? The mix for the piece is based on ultrasound, hydrophone recordings below the water and also of echolocation sound in audible range. The recordings were made at various locations in Central Park and on the East River in New York, USA, a forest outside Kaliningrad in Russia, Regents Park in London, UK, and various locations in Norway, Denmark and Sweden. The ultrasound recordings are time-stretched to bring them into a frequency range audible for humans. Links: Ars Acustica

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