How Do You Insure That the Output Is Perceptual?

How do you insure that the output is going to be something that is pleasing to the ears? Or do you not care that? That is the big question, right? I guess, right to the root of what we're doing in generative art. Because you can write a system that outputs random stuff. What we're working with is a perceptual mapping and so that's the artist part of it,. You're trying to find a system that that maps perceptually to something interesting. Is is the secret sauce of what it is, whether you're working visually or for music. In this case, i some i can tell you about some of the parometers that i'm using. And there