Is there an option to change or deactivate the second sound?
@SucheSchachfreund yes in settings (prefences)
I mean...there aren't very many options....and they're all in the same place, so....if you find one option.....you find all the options....then you can try them out and see if it's what you like..... and if not, put it back. Sort of what you'd do on any other app/site/etc.
Click on username
Click "sound"
Then move the bar down to lower the volume. You can also change the different types of sound you hear: