What do you use when you can't hear letters?

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Across
  1. 3. 1000
  2. 5. In French Canada.
  3. 6. Domesticated radiation.
  4. 11. An ethnic and language group from southern Africa.
  5. 12. Say again?
  6. 14. Congratulations, you did it!
  7. 16. The theme of this crossword.
  8. 20. A triangle at rivers' end.
  9. 22. Green?
  10. 24. Charles, familiarly.
  11. 25. What you wear to work, pronounced funny. (But spelled normal)
  12. 28. The winner!
Down
  1. 1. American (derogatory), especially New Englanders.
  2. 2. A stiff drink.
  3. 4. Trophy from The Acadamy Awards, commonly.
  4. 7. Of course we start Greek (intended spelling)
  5. 8. The most populated country in the world.
  6. 9. Of course we start Greek (common English spelling)
  7. 10. If waltzing was jazz.
  8. 13. Stay here for a few nights.
  9. 15. Mountains.
  10. 17. Dad.
  11. 18. 11
  12. 19. "But soft! What light through yonder window breaks?"
  13. 21. A Latin American dance.
  14. 23. A flower by any other name?
  15. 26. * Michaelphone,,
  16. 27. Somewhere in Peru. (Or beans, but pronounce it like in Peru)