As far as I know, I've seen proof that a sound designer guy in Bethesda's Studios had a hand on all the music, all the sound effects and even all the trailers of Skyrim lol

The only thing I know is done separately (besides the OST on some cases) are the recording of voice actors.

Now, engines do come with real time sound effects these days (which is the only way to do realistic sounding stuff unless you use heavily scripted scenes), so I think that the sound processing code is made by programmers while sound engineers/designers are there for tweaking the results (and even then you'd be stepping in a level designer role).

But those are my (un)educated guesses only...

As far as I know, I've seen proof that a sound designer guy in Bethesda's Studios had a hand on all the music, all the sound effects and even all the trailers of Skyrim lol

The only thing I know is done separately (besides the OST on some cases) are the recording of voice actors.

Now, engines do come with real time sound effects these days (which is the only way to do realistic sounding stuff unless you use heavily scripted scenes), so I think that the sound processing code is made by programmers while sound engineers/designers are there for tweaking the results.

But those are my (un)educated guesses only...