Double whole note

Hi. I'm interested in create a musical piece with your program, but i need to use "doble whole note" or (breve) and its rest. If this feature is implemented i don't know how use it with note spell (N).

If you don't understand me, see this at wikipedia:

http://en.wikipedia.org/wiki/Double_whole_note
http://en.wikipedia.org/wiki/Rest_(music)

Thanks for all.