Calling all audiophiles, I have a question

[ParanoiaDragon]

I was wondering if there's any kind of program that can take wav files & "scratch" them as it were.  My wife recalls there being some sort of DJ at her company's end of the year party, that seemed to have a device, possibly with a touch screen, where they would mix songs together, & scratch them like a record.  Anyone here know anything about any of this?  I'd rather ask here where I know people, & get their thoughts, then doing some random googling(though, if no one here is in the know, then I'll do what I must). 

Hopefully there's different models of whatever device or software can do such a thing.  I'm not made of money, & it's litteraly for one game project, atleast for now anyways, as I can't think of any others offhand where such a feature would come in handy.