Well I may take a listen and see, but re ultra sonic:

I read somewhere (interview with US) that "move your ass" was a direct rip-off of "check your head" and there was one other track they did it too aswell and am sure move your ass was 1st big hit for scooter.

I just dont like how scooters tracks get called rave music/ techno etc. cuz it aint its awful euro-pop (IMO!)