Thank you all, I've fixed the problem.
Now I can't get the music for FreeSpace 1 in the fs1port.
I mean, I've put the music.tbl in the proper directory and I have the warble_fs1.vp.
The game starts, there are no problem, the music.tbl is accepted, BUT there are no FS1 music in the Great War. The music is still the same (FS2_Amb_01.wav I guess) and never change during the mission.
Precisely, what I have to do to have fs1 music work in fs1 main campaign (FS1port2)?