Hi,
You should always select "Master" not "A" or "B" as the recording-source.
Enjoy!
P.S: Headphone-signal aka pfl aka cue has nothing to do with what is coming out your speakers, it is routed "pre-fader" (PFL=pre fader listening) to your headphones, so you, the DJ
, can hear the music before the crowd does!
P.P.S: Read alittle into the basics of what you´re using, it´ll save you many frustrating moments.
cheers
J