Hi Louis!
I remember you asking if anyone knew of a library to help with drawing music notation. I discovered one today called GUIDOLib so I thought I'd mention it here to see if you'd already heard of it and evaluated its potential for use in improving the pb notation display?
http://guidolib.sourceforge.net/http://lad.linuxaudio.org/events/2009_cdm/slides/guidolib.pdf