Not really better but a bit different.
BTW, here's how (without terminal):
*Find a startup sound you like and d/l it
*Convert to ogg using a web site converter
*Rename it desktop-login.ogg
*Right click it and copy
*Open Files and hit Ctrl-L to open a location
*Paste in /usr/share/sounds/zorin/stereo and hit Enter
*Click the three dots at the top and click Open as Administrator (I'm assuming you've installed nautilus-admin)
*Rename the current desktop-login.ogg by adding OLD to it (or something)
*Right click a blank spot and paste in the new the desktop-login.ogg
It would be nice if you could just browse to another file but you'll just screw up the path and have to paste it back in. Don't ask me how I know.
/usr/bin/canberra-gtk-play --id="desktop-login" --description="GNOME Login"