not sure if we're talking about the same thing. I'm referring to the KF1 output of the pad module as seen in this youtube video:
https://youtu.be/qc6rZvoTKWk?t=4m13s
Is that what you mean as well?
OH! Okay, that. I honestly hadn't ever noticed that before LOL
Just messin with it a little here ..... what it does is pitch shift. You can stick a CV Modulator module between it and whatever you connect it to to have more control.
I have no idea what "KF" stands for, but I'm guessing the "F" stands for frequency. I wonder if it responds to pad velocity. ... hmm
EDIT: Nope. Pad velocity has nothing to do with it. ... I messed with routing it to various places, and BOY can it have some very cool and interesting effects!! Thanks for bringing this to my attention. Like I said, I'd never really noticed or used it before.
I'm pretty sure it's related to the "K Freq," "K Damp," and "K Noise" parameters tho. Somehow. I'm just not sure how.