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Interesting to watch.

However, so much of the sound differences could be explained by things outside of the physical make-up of the ligature (a ligature slid up/down 1mm further than the previous ligature, slightly off-center, perhaps his embouchure changed to accommodate the screws, perhaps he took in a few mm more/less mouthpiece, unconscious oral cavity modifications, slight differences in angle of clarinet to embouchure, a reed warped to fit the previous ligature better, etc.)