Functional Minecraft Siren concept using the Immersive Railroading mod 

as you can tell I'm not that good at 3d modeling but I'm good enough to get the job done.
you can download this and start messing around with it but it only has a modulator as of the making of this video.
Pack: www.curseforge.com/minecraft/...
NOTE: I will update the pack with some more sirens in the near future