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Complex instruments, even those used only by "gurus" still need reasonable human interfaces. There are elements that need to be considered in any interface: consistency, intuitiveness, obviousness, utility, and ease of use. Even "gurus" shouldn't have to learn the ins and outs of strange operations; most of them probably don't want to learn it, either. Their focus is to use the instrument, not to become an expert on it. This article discusses a case study on human interfaces in instruments.