Huh. Interesting and odd. The sound isn't supposed to be especially loud to begin with, but I am not a tech savvy enough person to instinctively understand why there'd be such a variance on different platforms. Sadly, I pretty much have to release the Mac/Linux versions of my unity games "as is" for now...I don't have the hardware to test them. Never owned a mac, and my Linux laptop bit the dust a few months before I made this. Hopefully, will find solutions in the future.