Unable to find function in labview labeled "si wave"

I'm in a class that has a labview course, the teacher gave us a PDF with开发者_C百科 a block diagram picture in which several icons are displayed. One of the icons is unknown to us, we are trying to find it, is it part of labview, or have you seen it before in the function libraries?

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Found it here:

Program Files\National Instruments\LabVIEW 2009\vi.lib\sound\lvsound.llb

it was a subvi named Snd Read Waveform.vi