Well yeah The Powder Toy is the best "falling sandgames" physic simulation game that it ever exist and supports many complex things and is very easy to modify.
And Generataded sounds ARE possible, but is the coding for that complex or would be really calculating intensive? I think TPT will get far more intressed if this is implented.

And you were looking for unique suggestion and so i did one

hmm yes but i mean GENERATING sounds so that it creates random generated sounds for different elements and so on. not a fixed file. And not by a element like you suggested it. And by unique it was judgement of an similary game like that but there gives NO Game that has sounds that plays when a certatin action happens, not to speak of computer generated musics

But afaik they were Elemental suggestion. And it seems they are about SOUNDS file but not random generated and i look mostly on feedback not on other subs