You can use advanced search functions that require some server-side processing.
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Private Function
You can perform chord progressions privately so that others cannot see them, and search for private posts. You can use Chord Progression Base for your convenience only.
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Rich Color Theme
You can freely choose from a wide range of color themes.
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Perpetual License
This is not a subscription. Once you purchase it, you can use the basic features of Premium that will be introduced in the future without any additional charge.