david,
by what criteria are you judging 'chiaroscuro'? do you use spectral analysis for such an estimation? do you adjust for voice size and room size? if you are going by listening with your own ears, how do you know you have the same standard throughout the four years of a typical student's time with you?
i'm not arguing against fairness, i am arguing against the notion that true objective judgments can be made about an activity that is appreciated subjectively. and oddly, i encourage you to keep looking.
mike
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