DJ on Youtube is web application allows you to DJing music uploaded to Youtube.
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DJing with 2decks
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Effectors
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EQ
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Display waveform
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BPM detection
…and more
Things you may want to cover:
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Ruby version
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System dependencies
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Configuration
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Database creation
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Database initialization
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How to run the test suite
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Services (job queues, cache servers, search engines, etc.)
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Deployment instructions
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…
Please feel free to use a different markup language if you do not plan to run rake doc:app.