The final possible error is that humans had to judge what sounds were brighter
than others. A given tone played with no reference may sound a variety of different
ways to different performers. Certainly extremely bright sounds will normally be
indentified as such, as will extremely dark ones. Where those in the middle fall,
however, is often difficult to discern and based more on the individual player's
judgement than the raw data able to be collected by any computer.
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