Place this reaction after the reveal shot, not over the build-up. Lead into it with the wrong answer game show buzzer for a clear fail, or run it before kids cheering when a second attempt finally succeeds and the mood needs to flip upward.
このサウンドについて
This is a short 2.7-second crowd reaction clip of an audience giving a soft, drawn-out ooh that melts into a disappointed aww. There is no single voice, just the group sound rising and falling together. It feels sympathetic and a little deflated, like shared pity for something that almost worked but missed, making a letdown sound gentle rather than harsh.