* Files import/export plugins 
   - abc V.2 (once ready)
   - MIDI
   - niff
   - free software notation programs files
   - finale (a lot of work! reverse enginering)
   - gscore ? :)
 
* Plugin API
   - Handling actions inside the program

* Interface
   - Keyboard actions and cursor (Done)

* I/O
   - MIDI input from a MIDI port
   - correction/highlighting
