She sang right in the middle of every pitch and had a lovely vibrato.
Both had a finetune bridge and Hagstrom vibrato, and were available in mahogany sunburst or red sunburst.
I use three keys so as to play in the middle, upper and lower range, using no vibrato and then some vibrato.
adding vibrato to a flute sound would be one example of it's use - the harder you blow, the greater the intensity.
James's distinctive tone, which has a very fast vibrato, sounded as bright and hard as a diamond.