PKCS? No idea what that's talking about.
I just gave this a try and it's more difficult than I thought - some sound channels have both noise
and music alternating. That means you'd have to record each track, edit out the noise, and mix them back together.
Well that posed some problems because A) for some reason, lossless internal recording isn't working for me, and B) I can't find a player that lets me disable channels and save to wav. (I can get one or the other, but not both.)
I can get slightly-lossy recordings, you probably won't notice any difference in them, but it will take time to clean up.