erm btw , all cdda is played trough cdda , look at games like payback..ITS paula only! .. no ahi etc.
ie all you need is a mixing of the channels, i use a soundcard for that (cd input) but there is that cable i talked about in the last post , or make one on your own, its dead simple!
only 1 downfall with this, you will loose quality but not much and if you do a proper job its well worth a try.
option 3 , get a amplifier with several inputs to 1 output , hook up cdda signal there + paula and let the amplifier mix it.
cheers