It was mentioned that Airbus has an automated V1 callout.
Does that occur at V1 or at V1-x?
Quote from A380 FCOM
An auto-callout announces when the speed reaches V1.
Without any doubt the auto-callout for V1 is announced slightly before V1 is reached.
I don't know how the call-out is programmed, but 2 knots or thereabouts before V1 seems to be consistent.