@cedric5555 I tried the game in mame2003plus. Audio is not perfect but it's there. If you shoot while the intro music to level 1 is played, the music is cut until the main level 1 music starts, then it seems to be fine. With fb-neo, overall all the volume was a bit lower. when the intro music is played and you shoot, the music is not interrupted and you can't hear your shooting until the main level music starts.
I don't know which one's right, but fb-neo might be the better one. I'm using a pi4 so it might be too slow on a pi3.