504, was born with a small stuttering issue that only really happened when he was nervous or frightened. 504 also really liked singing, it was one of his favorite things to do, he also sometimes would use it as a coping mechanism, for when he was stressed or many other thing.

Then the genocide run happened in his au. One thing he did to stop himself from having a mental breakdown in these runs was. Sing to himself, in one of these genocide runs his frisk caught him singing and made fun of him for it. Ever sense that run happened she would tease 504 over his voice and how “bad” it sounded. Those memories were engraved into 504’s mind and he started to believe it. This is why he hates his voice.

Unfortunately, you can’t. 504 went insane and deleted his universe’s code.

It appears you forget that error 504 is extremely dangerous, and could end your existence without hesitation.

Yes