Don't be so defensive Donny. Miles muted trumpet (and flugelhorn) is one of the most recognizable in all of jazz. As far as I'm concerned, that was a legitimate criticism. I've listened to Miles for fifty years and I never heard him play a single note with vibrato on it. Besides, I think it was more of an observation than a criticism.
chas
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"Faith means not wanting to know what is true." [Nietzsche]