I'm not sure when you are referring to, but I didn't hear any high pitched noises that were not part of songs at any time I was in there.
Also, the entire set of dances is designed to cater for as many tastes and styles as can be reasonably fitted into a schedule, if there is a particular genre or DJ that you would like to hear please email in and ask/suggest what it is you would like to hear.
The volume levels are balanced against the need to ensure a decent sound level and not to be excessive to disturb other hotel residents or attendees who don't want excessive levels of sound. In the dance contest as well it's supposed to be music to dance to for the performers, not to distract from the main thing of the actual dancing skills on show.