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Any ideas for improving vibrato? Mine is a slow, rather imperfect kind which doesn't quite take off
Put the scroll against the wall and set your metronome to 60. Vibrate your finger just once per click until you can do it solidly at that speed. Then up the speed by 5 and repeat until you get to about 80. Then do the whole thing again but with 2 vibrates per click. Then again with 3 vibrates per click. Then increase from 80 (with one vibrate per click) till you get to 200. Or you could make up your own system! The idea is to create a strong vibrato at a slow speed and then reproduce it at higher speeds. This serves two functions: you strengthen your vibrato, while also learning how to control and vary the speed.
However, you do need someone who really knows their stuff to look at the shape of your vibrato before you attempt all this, to make sure you're doing it in the right way. Not a good idea to reinforce a bad habit which will then be even harder to break! Also bear in mind there are several different ways of approaching vibrato; Sheila Nelson likes the upper arm to wobble, so the wrist/hand is vibrating in a more sideways direction. Other people think the hand should be moving from a more scroll-wards direction. Then there's arm vibrato, wrist vibrato, string vibrato...
The more old-fashioned fast, narrow vibrato was more of a finger vibrato. The wider vibratos you hear more these days tend to use more arm. Personally I tend to prefer the sound of the narrower, faster vibrato because I prefer the sound of the older players - others will differ in their preference. Get a professional to have a look at your vibrato, show you the different styles, and then work on perfecting your preferred vibrato sound(s). In the end you will need a variety of different vibratos for different modes of expression. What a complex subject!
Violinia