I know what you mean Chuck. Having turned off all effects, I thought at first it was an effect of beat frequencies between the two or more component parts of a voice - one voice being slightly detuned compared with the other. However, on investigating the Symphonic Strings in the sound editor and turning off the Mercato component, the 'Wow Wow...' effect you describe is still there and what's more, it's also there on the Classical Strings component. It's also worse on some notes than others. My conclusion is that it must be in the original sample

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Willum