@Morphoice
skew = hslider("[01]Curve", 1, 0.1, 10, 0.01);
range = hslider("[02]Range", 1, 0, 1, 0.01);
There's also a bug where if you add another parameter to a faust node which already has it built, you have to manually rebuild the parameters by clicking the three dots (where you create a new Faust file) and you'll find the option there.