Property of 录制 声 which expose suggest or at least do 不 hide the 源 to which they belong A vector pointing in the opposite 方向 to 内在化 it 提及 to the 'non-abstractness' of 声 i e to their 语义（上下文） away from 本质 criteria of 感知 By 参考 声 I should like to designate only those which point towards a more macroscopic 设置 referring to 自然 scenes and 现象 人类 or 机械学 活动 It is 不 their real origin that matters but their power of evoking extrinsic 设置 A 参考 声波 can even be of synthetic origin e g a 滤器 sweep in a 带/乐队 of white 噪 could refer to 'wind' 源 - Rodolfo Caesar 1992 The 作曲 of 電聲學/电声学 樂/乐 PhD Thesis University of East Anglia