Select some notes and rests. Run the plugin and they are re-written at half the duration.
This plugin is written as a starter for others to modify it into something more flexible that can be used to convert, for example, a piece written in 2/4 time into 6/8. It currently only halves the length of the notes and rests (but this is easy to modify) and it currently gives unacceptable results for transposing instruments (again, I'm sure someone can sort this).
Fixed bug where last note got missed out.
For use with transposing instruments, simply check Menu item "Notes > Concert Pitch".