1960's Recording tech

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Across
  1. 1. the only tape maker still in business
  2. 3. time code for film
  3. 7. a vibrating system increasing in energy
  4. 8. a method of overdubbing
  5. 9. first tape machine
  6. 10. company that partnered with RCA
  7. 11. recording tracks over other tracks
Down
  1. 1. inventor of am and fm radio
  2. 2. a certain type of reverb
  3. 4. inventor of ribbon mic for rca
  4. 5. inventor of guitar and overdubbing
  5. 6. boutique amplifier maker