Get time for a given value for a curve

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This function outputs the float value at a specific time. I want to do the opposite, i.e. output the time(or the times) where a particular float value occurs. Any help regarding the same would be greatly appreciated.

I once searched for this, and afaic it’s not possible. Because there can be no repeated values of X (time), but the values of Y can be repeated a lot.

You can try and create an inverted curve and use that.