error correction

[Kriist@aol.com]

i was reading the flyer that goes along with the subtropics festival(south 
floridas new music festival)
one of the composers featured performed 'prepared cds'
he somehow(hence this inquiry)disabled the error correction function on 
the 
cd player he would then put scotch tape with pinholes(one of the things he 
did)on the cd and play it(i guess hit the thing)
he said that it changed the pitch, the timbre, hell, everything
so may question to all of you tech savy guys(and gals)out there
how hard is it to disable the error correction 

rodrig