It's hard to say. Maybe it was inspired by some real elements, but not a direct retelling of a specific true story. We might need more research or official statements to know for sure.
If 'dead sound' is the title of something based on a true story, it could cover a wide range of topics. For example, it might be about a historical event where a particular sound was significant, like the sound of a siren during a war or the sound of a bell tolling at a tragic moment. Or it could be related to a mystery where a strange sound was part of the case.
I'm not entirely sure specifically which 'dead sound based on true story' you're referring to. It could be a movie, a music album, or some other form of media. Without more context, it's hard to say exactly what it's about.
One possible example could be a story set in a cemetery. The 'dead sound' could be the howling wind that people who work there at night have reported. If this was used as the basis for a story, it would be a 'dead sound based on a true story'. The wind sound might be incorporated into a plot about the spirits of the dead being restless, using the real - life experiences of those who heard it to add authenticity.
I'm not sure specifically which 'dead sound true story' you're referring to. There could be various stories related to that name. It might be about a particular musical event where the sound went 'dead' in an unexpected way during a performance, or perhaps it's related to some spooky or mysterious occurrence where a 'dead' or muted sound played a crucial role in the true events that unfolded.