For those that haven't seen it, SPEAR is quite an impressive application. 
Presently it doesn't draw, but its graphic editing capabilties are strong. 

http://www.klingbeil.com/spear/


peiman wrote:

> Correct me if I'm wrong,
>
> doesn't metasynth's drawing tool deal with the spectrum? It would be
> interesting to have a tool that lets you draw pvoc files. Also waveforms
> that you can import into a table, not only score notes.
>
> Just some thoughts.
>
> Peiman