Thanks the answer!
So, step by step.
The program stars and I select the audio stuffs;
and the game starts and there is the intro with music but no speaking voice;
and the game should load the UI BUT shows only a black screen with some background sound.
I checked a video on youtube about this game and when the screen shows a purple animation
and after this becomes white
and after this black at that time MY DOSBox stays in that black state.
So, what you hear in the video I hear it too but there is no screen... only a black one.
https://youtu.be/EWuUb0aOm2g?t=97