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The vibrato needs a bit of airflow to activate all of its moving parts, so it doesn't work at very low volumes. For this reason, practicing going from a low-volume tremolo into a vibrato is time well spent. The practice is straight forward, start playing a note as softly as possible, using a tremolo of course, and as the volume increases enough to use the vibrato, switch to a vibrato as smoothly as you can (not allowing the vibrato to kick start and start swing hard and fast... the goal is a smooth transition). continue reading...