Have you considered something like Myriad's software (Harmony Assistant - http://www.myriad-online.com), which can export midi entered data to .sty format? It sounds like that kind of a tool would be just your thing.
I like your drag'n-drop idea though, it would be nice if we didn't need to look elsewhere for this sort of thing.


Just because you can, doesn't mean you should!
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BBox 2022 Audiophile, Mac Pro Intel, OSX 10.6.8, 800x600 (TV VGA)