Hey Thuk,
The Instant Flanger doesn’t have an explicit way to do a proper through zero flange, although there is a neat little trick that it does which I think makes it unique. Perhaps with two instances you could get that sound. You would probably need use the retrig parameter to ensure that the LFOs are properly out of sync with each other, and sum the outputs of the two instances together. That would be your best bet, although I haven’t tried it myself so couldn’t confirm it would be what you’re looking for.
The neat little trick is that there is a sort of pseudo through-zero effect that happens on the Instant Flanger hardware and plugin, although we probably don’t hear it as being that. There are phase shifters that get applied to the dry signal of the Instant Flanger so for certain frequencies there can be some scenarios where the dry signal is more delayed than the delayed signal which is the through zero effect. Again, probably not the same sound since a proper through zero effect is much more pronounced and would happen at all frequencies.
Hope that info was helpful or interesting, and good luck! I love the sound of the Instant Flanger and it was a blast to work on that plugin so I hope you enjoy.
~Woody
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