I went through that scene again. The track is the one that starts playing after clicking Halim's line "Follow me, please! I'll show you around." After that, the location changes to the common room of the harem. There are a few seconds of silence at the beginning, but then the music with the "preview" voice fades in. It starts with a guitar-like sound, then some shakers join, then some other drums...but I'll guess you can figure out which track it is by just looking up the code and seeing what file plays. The voice can best be heard in the first few seconds, before all the other instruments join in. It repeats about every 5 seconds. It's pretty quiet and subtle compared to other "watemarks" I've heard, so it's understandable that this one flew under the radar.