Sure, because in the case where differentiation of very similar signals is necessary, the human ear is too obtuse an organ of measurement. You might show kids the output from such an instrument as a brief exhibit piece in explaining a more relatable scientific fact such a tool would allow us to discover, e.g. that birds can pick out their own chicks' cries from those of their fellow species kin, but that's teaching about the bird's sensitivity. Not developing the learner's ability to analyze that. You would not use an oscilloscope as a means to teach the sparrow's call from the blue jay's from the robin's from the jackdaw's.