I find the extension to work very well, although there seems to be a little bit of sympathetic vibrations going through it. I find that the chromatic could be better, if harder to use, than the mechanical because of the buzzing, but it isn't anything the audience would be able to hear AND most of the players in NY Phil appeared to be using mechanicals so I think that is something that is common.
NOTE: The buzzing only occurs on the open G and Ab on the G string and only while playing pizzacato and it definitely comes from the Extension. Rather odd.
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