One Step Closer At Rock Am Ring 2004

If you saw Rock am ring 2004 at one step closer, before the bridge of the song where :chaz: is saying "shut up" what Brad is doing with his guitar?
Can someone help me pls...?

 

He makes noises on the guitar, but not the hard ones. Like a string sound or something

 

You just hit your knee on the back of the fret board. You have to have it pluged into a amp though.

 

I thought he was changing a string or something like that

 

wouldnt be possible lol because theres no way he could to it that fast and tune it correctly in that ammount of time unless hes like the flash or somethin

 

He uses his effects pedals. Once he was about to do the sound he presses down the pedal and bangs his knees on the back of the frets. Then he would press it again and it goes back to a regular sound of the gutair.

 

it basically making really small vibrations that the 'pick ups' pick up on, without actually playing a cord. you can get some odd ball sounds by doing it - which brad does on the track!