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The SignalEditor is an extensible set of general purpose tools for viewing, analyzing, editing, and processing sampled signals on the IRCAM Musical Workstation (IMW). Its main intention is to provide the composer and the scientist with a sophisticated interface to handle digital audio signals naturally. This involves a high quality graphics interface, a flexible signal analysis system, an efficient sound file system, and a powerful signal processing environment. In this paper we discuss a prototype implementation of the spectrogram editing facilities, some aspects of the editor's extension language and the lowest layer of the sound file system.