Mattia
Yes, bg noise were very annoying. I checked while on the call and very surprisingly you cannot mute those sounds for the channel. However each user can mute them in their own user settings. I checked sounds off from my user settings and everything was smooth. Seems like it should be the other way but for now that's how it is I am afraid
There are different types of voice channels and discord. You can set one up that requires a moderator to invite people to speak and everyone is automatically muted to reduce background noise. Also there are bots for recording in channel. We use Craig