Transposing a recording scales its formants along with its pitch, which never happens to a real instrument. Key splits, velocity layers, round-robin, and the memory bill each of them runs up.
Record one note of a piano, spread it across the keyboard, and the instrument works — for about five semitones in each direction. Past that it stops sounding like a piano and starts sounding like a piano that has been resized, and the reason is specific enough to be worth getting exactly right.
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