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Sound formats
- Optical Tracks
- Mono
- variable density vs. variable area
- magenta vs. cyan vs. black/silver/gray
- SR
- Dolby A
- Mono
- Digital
- SRD / Dolby Digital
- DTS
- SDDS
- Magnetic
- Sound on disc
- Silent films
- optical vs. digital vs. mag
- Amplifiers?
- Sound processors
- Speakers