So Catalinbreads new Flanger pedal the Zero point is an interesting beast, it's got 2 switches, one for turning the pedal on and off, and the other is the real-time effect control which unlike predictable LFO based and digital approximations of a Flanger, really does reproduce the effect of actually holding a thumb down on a tape reel the way the effect would have been originally created.
Check the demo video to see it in action, and here's what Catalinbread have to say about it themselves:
"When the Zero Point is engaged two delay lines are turned on, subtly modulating against the other simulating the comb filtering effect akin to the playback of two tape machines. Pressing and holding the "Flange Push-Button" causes one of the delay lines to slowly shift time toward the other delay line, up to the point that your signal begins to cancel out, THE ZERO POINT! Release the Flange Push-Button and the delay line begins to automatically fall again. The result is the whispy subtractive 'thru-zero' sound that creates a sense of space and mystery. An effect that up until now we've only heard on records. It behaves just like manually advancing the take up reel and pressing your thumb on the supply reel to slow the program down.
The Zero Point Flanger automatically powers up in the inverted phase mode, resulting in a more dramatic subtractive flange effect. If you press and hold the Flange Push-Button while powering up the Zero Point you enter the positive phase mode which because it sums the two delay lines, never cancels out. This mode is a bit less dramatic than the subtractive mode but still a very tape like analogy. There are merits to both modes, ultimately it is best left up to personal preference."