you got my attention Ian, again !
in reality that annoying issue happened a bit later in gameplay on neo4all
it can be on second, third or later stages if you are lucky enough
i remember that using a previous neo4all release (rc2 perhaps) you could simply return to the main emulator menu
and turn the cdda back 'on', but with later releases this was useless
if you think that the fourth stage (castle of demons) has one of my fave soundtracks ever, you got my disappoint
last levels of this game are true PITA!
many thanks for the test! i cannot wait to try it