Put it at the point a reply arrives in your edit, after a stretch of keyboard typing sound and before a shocked sound for the person reading it, so the message, the typing and the reaction form one clear exchange.
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This is a short, under-a-second iPhone chime, a clean two-note alert that signals a message has just arrived. It feels instantly familiar and mildly urgent, the kind of sound that makes you glance at your phone even when it is not yours. It comes from the iPhone's message notification, so it carries that everyday, always-on feeling.