[Avodah] Blowing shofar with a mask on the end

[Marty Bluke]

To prevent the spread of COVID see
https://www.timesofisrael.com/put-a-face-mask-on-your-shofar-so-it-wont-blast-virus-to-worshipers-experts/

What are the halachic implications of putting a mask on the end of the
shofar? Does it affect the sound?
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