If you’re interested in doing the tweaking, sculpting your own set of tones traversable by one or a few sliders is doable with Rebecca Fiebrink’s “wekinator” ,

If you’re interested in doing the tweaking, sculpting your own set of tones traversable by one or a few sliders is doable with Rebecca Fiebrink’s “wekinator” , which gives you a GUI for “recording” that catalogue. Not sure if a similar M4L device has come out since. OPs project looks like a cool way for plugin devs to make a demo slider.