Use it as the first reaction in a short edit, then follow it with Anime Ahh for a bigger response and finish with Anime Ahhh to close the sequence. Keep it early in the edit, before the main reaction clips, so the sequence builds in stages.
このサウンドについて
This is a very short vocal clip built around a single 'iooh' exclamation, lasting under a second and landing as one quick burst of sound. It feels surprised and playful, like a small gasp that turns into a smile, and it works best as a light reaction rather than a statement. The brief delivery keeps the focus on that one expressive moment.