I, too, am having this problem. I'm using Audition 1.5 and recording and playing back through a Soundblaster Audigy 2 ZS. What seems to be happening is Audition is recording on 'What U Hear' mode rather than just the signal from Line-in 2 (which is what I want to record). Normally some Soundblaster software lets you select which input you want to record from (or the all-inclusive 'What U Hear'), but for some reason that software doesn't seem to exist on my computer anymore, and it looks like Creative Labs has discontinued support for the Audigy 2 ZS. ... Uh... help!