Hi there:

I don't know what happened....but at some point, after several loading games, the volume of the music went almost totally down...I cannot even hear it.

Does anybody else have noticed this?

Thanks!

Keep pressed F9 and then press right to increase the volume (and left to decrease it).

Ahhh, too late...I have finished the game already, but I hope this helps others with the same problem. Thanks!
Amazing nostalgia experience, by the way!

Oh, well, at least you were able to enjoy the game nevertheless. Cheers.