Hi. First off all you should use another game for your testing, because the cdda in nc2 is mostl zombie voices, like ahhh and uhhh, and you can be induced to error thinking the cdda is working and is not... For example in the beginning after geting out of the cell and kiling the first zombie you enter a door and a sequence of a monster getting up of a bed, this monster should do some mumblilg like arhhh or urhh, if it doesn't the cdda is not working, because this is a point where the cdda is called, compare with original gdi.I also was induced in error because the cdda seems to be working but is not.the cdda in this game is called in special animations like bosses and stuff.
wince games with cdda that i managed to make work perfect so far using 3 audio dummy tracks(real cdda from track4), using bincon and then binhack(the normal method)
4x4 evo,championship surfer,wild metal,ducati world,taxi 2 le jeu, railroad tycoon 2
Other games that only part off cdda work:bang gunship elite; the missions music work but not in title.It must have two way of calling cdda one by track(the missions music that work) and by lba(the title that doesnt).I have see this issue in katana games as well, in games like sega gt, aquagt,and dave mirra.If you put in options and test the music the music 99% of time plays but if you press the button to repeat a track sometimes you only hear silence.in nulldc log you will see when this happens the lba called is too damm big even for a gd rom.this dont hapen in the gdi.Looks like a fix of the game developers that call the cdda by lba and so cdda.exe doesnt fix these...
I hope you luck in fixing the wince cdda, because is the bigest dreamcast mystery ever since. Count with my help. cheers