RE: This sound
It's a saw wav in a synth (or a preset in some cheap synth, or, most likely just a straight keyboard). I'm sure you can replucate it in dimension with some experimenting with loading saw wavs into presets then tweaking, and maybe adding some light distortion effect on the track. I'm sure you can do it in Rapture too, I say dimension, because it has more presets, and more wavs to work with. But IMO, it sounds cheap and cheezy. Actually almost sounds like a kiddy Casino with some reverb.