This 术语 designates 操作 in the 工作室 that 改变 the 自然 and 参考 character of a 声音 extracting from it 参考 criteria presenting a more 抽象 音乐 潜力 more 抽象 than its 原始/原创 reference 变形 of any order like filtering enveloping or 音高移位 改变 声音 by partially of totally removing traces of their 原始/原创 causes 源 - Rodolfo Caesar 1992 The 作曲 of 电子声学 音乐 PhD Thesis University of East Anglia