I think i've just found my new favourite flanger i'm buying this immediately!!

In the demo with the metal zone, reminds me to the flanger on the band Tool

Danelectro accidentally made a really good flanger to use with synths, especially if you wire it in as a send effect on a mixer so you can maintain your original tone infront of it. I bought mine used to pair up with a Behringer WASP Deluxe re-issue which it's self has a crazy filter and when you add crazy to the crazy, it starts to make a lot more sense if you're going for fat, wide, thick, evolving, psychadelic wall of sound type stuff.

Even the minimum regen sounds like a lot. Its minimum is probably equivalent to around 3 o’clock setting on most flanger pedals. This pedal does not want to be tamed!

I had one of these 20 years ago used it for bass only with a little fuzz behind it. Absolutely unusable! Bought it on musicians Friend stupid deal of the day for $29.99. sold it back to guitar center for $79.99. but I do miss it. But it's way too much effect! Cool tho!