No, it wasn't just a sound effect. We (the SSDeV) did a joint project with some forensic scientists from the police where we opened the locks and they examined the locks for traces afterwards, partly to take a look at the marks that new tools like the multipick or foil impressioning keys leave and partly to train their own examiners to look for the classic techniques.
Anyway, the marks left by the multipick were, ehm... let's say remarkable.
The whole keyway was heavily scratched, the tips of some pins were heavily deformed and worst of all the shape of the keyway was scratched into the back of the lock, it looked like someone had grinded an image of the keyway onto the metall.
But apart from the fact that you might not call this non-destructive anymore, it's a very effective tool. I don't have one as it's far too expensive for a miserable little student like myself

but I've seen the old version without the digital frequency controler as well as the new version in action and it does its job. The old version sometimes had the problem that it was too fast and powerful for cheaper locks, because these used cheap springs which just couldn't handle the frequency (means no opening, they didn't break).
Anyway, I hate people who use this pick at competitions since you really can't concentrate because of the noise.
It's not the tools that open the lock. It's me.