Why I can't find "send time"transimission in metasound?????

When I’m learning the tutorial of metasound in link——MetaSounds in UE5: From Miniguns to Music | Unreal Engine - YouTube, at 18:43, I find he can connect “send time” with “second”
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but…i can’t…besides…why I don’t have “Transimission”, below is mine
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Need Helppppp!!!