Where 人类 beings are 听 to produce 声音 then we will tend to impute 目的 to the 声音 事件 We will 听 it at some 电平/级别 as an Utterance In 特殊 whenever the 人类 voice is used as a 源 of 声音 in whatever 语义（上下文） the 概念 of Utterance will enter at some 电平/级别 into our 理解 of the 事件 This becomes 尤其 重要 in the 球体（范围） of 电子声学 音乐 projected in the 虚拟 空间 of 扬声器 where we can no longer rely on the 物理 and 社会 cues of the concert hall In 一般 non-music 声音 产生 by individual creatures may be taken to indicate or express something about 内在 state reaction to 环境 events 响应/反应 to utterances by other creatures At whatever 电平/级别 the 感觉 of Utterance whether as indicator 信号 符号 sign or syntactic or semantic-syntactic 流 enters into our 感知 of the events 源 - Trevor Wishart 1985 On 声音 艺术 York Imagineering Press