4. Economizing amount of pitches

This is an economizing model and can not be compared with the digital world's approach to infinite pitch adjustments.
But because of the relative few pitches IT can be used on a double manual harpsichord. Just Intonation is something different  playing it acoustically.

"Yes, many find the purity of computer-generated sounds utterly unnatural. The reason is that there will be a fixed pattern of phase cancellation among some of the coinciding partials depending on your onset times. This frozen pattern of phase cancellation does not occur in real music, where phase relationships among coinciding partials will cycle between constructive and destructive. Without this effect, the dyad or chord will sound like a single timbre rather than a harmony." Paul Erlich

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