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Your ears can be just as important as your eyes. If you heard it, call it.
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One camp, awhile back, suggested that making the close calls at 1st base came more from what you heard (Thud-Wap/Wap-Thud) as opposed to what you saw...
But I haven't found any mention of thuds, waps, taps, or plinks in either the ASA or Fed Rule books...