Eqd grand orbiter sweep control

[Danich_ivanov]

I'm working on this phaser/univibe pedal, and i would like to implement a kind of a tone control, possibly similar to "sweep" in a grand orbiter, does anyone know, or have an idea as to how it works, or alternative metods to achive similar effect? My guessing is that it has to do with the negative feedback cutting frequencies within wet signal in a similar manner tilt tone control does. But i'm not sure. Could also be a tone control after wet signal, but it doesn't sound like it, and is a bit silly. Could also have something to do with altering lfo/ota interaction. Another thing is that i actually have an old revision of grand orbiter, and thinking about tracing it, it's just that it looks like it won't be easy.

Thanks.

[Danich_ivanov]

Alright, i didn't fully trace it, but from the look of it, it looks like a ross phaser for the most part, with sweep resembling small stone's color switch adapted to be used as a pot.

Edit: Particularly the part of the color switch that switches lfo, not feedback part.