Make block update trigger once

Hello again, I had figured out the redstone thing, however now i have a new problem.

I am working on a siren sort of thing, and I am having a problem with making the sound, i am interested in making the siren play only once per redstone signal, this works if i don't use the custom block, because i am sending updates per block tick, which seems to not be working, i was wondering, if anyone maybe knows how i can do this?

This is the block for the siren:

when the sound effect plays, it seems to play multiple times, where it seems to spam it, basically i'm wondering, if there is anyway to fix this at all, or make the sound just play once somehow.

hope someone knows how to do this, thank you