Drone/ambient generative patch (work in progress)

Hello !

I'm working on a big project that I want to share when it will be done : create a patch that will generate soundscape and drone pads/textures.

For now, I made a timestretching/pitchshifting module with the groove attributes, but it seems that the timestretching is not really big. Even with the smallest values, I can recognize the original sound because it's not stretched enough.

Did I make a mistake ?
What's the best efficient way to make a timestretching/pitchshifting module ?