TODO
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0.12.x: miscellaneous fixes
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- Tracker widget scrollbars do not work
- Tracker widget does not use Pango

1.0.0: documentation/localization
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- Create a DTD for the file format
- Better documentation and/or online help
- Localization support?

1.1.x
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- Configurable keyboard
- Arpeggiator

1.2.x
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- Editing/playing multiple songs at the same time is not implemented
- Instrument specific note data maps are not implemented
