I suggest that there is more to it than meets the eye, like tongue blocking versus pursing the harp.
Here's Gary Burton talking about his instrument, http://www.wonderhowto.com/how-to/video/how-to-use-damper-and-sustain-pedals-on-the-vibraphone-244512/
Dan Berger wrote:instruments like vibraphone have a limited attack envelope.
You wouldn't think so if you saw Milt Jackson play live! I saw him play with two amllets in each hand.
what effect does that have on attack envelope?
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