Topic: Video about a Bechstein restoration that makes an interesting point
A Bechstein-created film about the Bechstein restored for Wigmore Hall in London.
https://www.youtube.com/watch?v=vgecQ1uytSA
Makes an interesting point about unisons at around 8:16: Each unison string is a different length, so each will have a slightly different inharmonicity, creating many
near-matches and near-misses for the partials as the unison tuning changes, contributing to what the technician here calls "singing" and "color" in the unisons.
He goes on to say that Steinway and others were all attempting similar things to create this extra dimension, as he also calls it, but that he's not sure that they got it right!