You made a binaural beat with 40hz? Binaural beats only work up to 30hz max. Gerald Oster's research shows that 26.6 is the max frequency for most people, but that some are able to perceive the beats up to 30hz. You can use isochronics for gamma, but I don't think they work past 40hz.
Did you watch the tutorial video? It should tell you everything you need to know.
You're finding the program easier to use without the pink noise? There's a check box next to each voice that will let you hide the voice at the bottom. If you hide it you won't accidentally select it; if that's the problem you're having.