In this paper we shall be picturing the sound production, in particular the mixing scenarios and the audio programming, of GROMA. GROMA is a permanent urban sound installation which incorporates early historic texts on urbanisation combined with environmental sounds from two of Cologne’s partner cities, Rotterdam and Liège, in an algorithmic multichannel composition. The installation was inaugurated in 2008 at the location of Europe’s largest underground parking lot in Cologne, situated in the area of Rheinauhafen. For producing the sound material, special methods had to be developed, that allow for the fine-grained aesthetical design of the sound in the unconventional venue, and that also support the aleatoric combination of the sound situations.
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