Hi, I've posted an MacOSX RefaceDX sound editor/generator.
It is very similar to Yamaha's soundmondo site. In addition to the sound editing, it has a sound generator.
So you can use it to generate "pseudorandom" sounds based on four attributes:
Percussive, Disonnance, Brightness, Randomness
Please feel free to check it out in the link below and let me know what you think!