Just playing another career mode. After a while, listening to the same lines from your engineer gets a bit old.
I went into options and searched. In audio settings I've found it - "Engineer Tutorials". Great, I turned it off.
I played some more and I noticed the same fecking tutorials still playing in the garage.
Either the option doesn't do anything, or there are some other tutorials I'm not aware of, which I've now turned off?