"...the sound is being used in a dance track, Buzzin', with secret melodies only young ears can hear.
Simon Morris from Compound Security said: "Following the success of the ringtone, a lot of people were asking us to do a bit more, so we got together with the producers Melodi and they came up with a full-length track.
"It has two harmonies - one that everyone can hear and one that only young people can hear.
"But it works well together or separate," he added."
There's a clip linked from the BBC story, or here directly (WMV format). Can't say the "secret melodies" are especially exciting (and yes, I can hear it!) but I suppose it's a clever idea. There could be some interesting steganographic possibilities, and indeed it could be used for 'cheating in tests' as Jason Thomas puts it here.
This is the same Simon Morris who's quoted in an earlier BBC story as saying that teenagers (in general) don't have a right "to congregate for no specific purpose", so it's interesting to see him getting involved with young peoples' music. Nevertheless, I can see the dilemma that Compound Security are in: they've created something designed to be unpleasant for teenagers, but are also capitalising on its potential appeal to teenagers. It's clever, if rather inconsistent branding practice.