What is that sound?

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Across
  1. 5. An instrument the whole of which vibrates to produce a sound when struck, shaken, or scraped
  2. 7. A small four-stringed guitar of Hawaiian origin
  3. 8. The character or quality of a musical sound or voice
  4. 10. Different tints, shades or tone
  5. 11. The beating or striking of a musical instrument
  6. 14. A wind instrument
Down
  1. 1. Describing words
  2. 2. A musical or vocal sound with reference to its pitch, quality, and strength
  3. 3. An instrument in which the sound is produced by a stretched membrane
  4. 4. A stringed instrument
  5. 6. A category of wind instruments
  6. 9. A musical instrument in which the sound is mostly produced of electrical means.
  7. 12. Material consisting of threads of cotton, hemp, or other material twisted together to form a thin length
  8. 13. A yellow alloy of copper and zinc