Hi Niclas.
on the down side, I'm afraid the missions don't introduce any new audio or extra scenes into the game. they are the same format plot wise as the missions you get with the game Ie, you get a briefing about your mission and have to go and carry it out.
On the pluss side however, the missions feature some very interesting enemies and conditions, ----- like enemies with better detection equipment, or giving you torpedos that targit the enemies more efficiently. the missions also vary in type, there's not just the "Destroy X Y Z" type of mission, but also protecting convoys or ships or bases, getting to certain areas before the enemy attacks, delivering things from one point to the other etc.
the missions are all about changes in playing the game, rather than in the sounds or new audio. If you like the first two missions, -------- particularly the 2nd, sinse it's more representatative of how the game works, you'll enjoy the user created ones, ----- I certainly do, though I'm pretty pathetic at Lone wolf in general and quite often end up in Davy Jones' locker.
raul gillegos used to have some very nice audio walkthroughs for Lone wolf available on his site. Unfortunately their not there anymore, but maybe you could get somebody who's got them to mirror them for you so that you can get an idea of how some of the other missions besides the first two go.
With our dreaming and singing, Ceaseless and sorrowless we! The glory about us clinging Of the glorious futures we see,
Our souls with high music ringing; O men! It must ever be
That we dwell in our dreaming and singing, A little apart from ye. (Arthur O'Shaughnessy 1873.)