Oliver's extremely cool awesome puzzle

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Across
  1. 4. moderately loud
  2. 5. intense music
  3. 7. loud
  4. 9. soft
  5. 11. very loud
  6. 13. orchestral family
  7. 15. orchestral family
  8. 16. orchestral family
Down
  1. 1. getting gradually lower
  2. 2. moderately soft
  3. 3. suddenly, only louder
  4. 6. getting gradually higher
  5. 8. very soft
  6. 10. orchestral family
  7. 12. We listen to it
  8. 14. volume in music