QUOTE(tiger_vio @ May 2 2006, 04:07 PM)

I have no idea how to do wrist vibrato, hm, I wondering if it's harder to switch to wrist after you've done arm for so long? Arm vibrato came very naturally to me
Wrist vibrato is a movement from the wrist up. If you wear a watch on your left wrist, the watch will be steady while the hand moves.
To get the wrist vibrato going
1. Go to approximately 4th position so that the base of the palm rests against the bottom edge of the bout (the rim of the BACK of the violin, not the top). This contact point will be the fulcrum of the motion.
2. Put 2nd finger on the A string (and no other fingers).
3. Vibrate along the length of the string--toward and away from the bridge--never left and right.
4. Work for a steady wobble--3 to 4 times a second.
5. If it stops, start it again. You have to teach your brain to keep this reflex going.
6. Keep the bow slow and strong all the while. To start with, the teacher can do the bow while the student concentrates on the vibrato.
7. Once you can do it in 4th position (leaning on the edge), move it back to 1st position. Change fingers and try to maintain the motion-don't let it stop.
8. Double check to see if the wrist watch is staying pretty much steady while the hand above the watchband moves.
9. Avoid a "finger vibrato" which involves only the knuckes. this is so small it will never be noticed by the listener.
Wrist vibrato is ALL that works in very high positions since the palm of the hand contacts the instrument. Players need to be able to do both kinds of vibratos sooner or later. The arm vibrato is best for big forte passages and the wrist for quieter, intimate moments. In the end you have to be able to switch between the two as needed.
Give it a try and let me know if it works or doesn't for you or if my instructions are incomprehensible.
Gabe Villasurda
Michigan USA