Addon(s) that makes sound travel further?

On big maps like gm_fork, the default soundlevels for most weapons / entities are pathetically small. It’s pretty hard to get satisfactory gunshot and explosion echos at a distance.

I remember once using an addon that incidentally makes sound travel further / more realistically, but it primarily added a doppler effect kind of feature to all sounds played. Does anyone know of this addon?

the doppler addon has been removed/privated on workshop meaning you can no longer get it

I was afraid that might have happened. Do you know of alternatives / mirrors?