i figured out a way to change the background music in nzp so that u dont have to keep listening to the background music that's already on there ^^. all u have to do is pic your favorite song download the instrumental version of it then make it into a wav file and fuse the to line of music together (if you have Audacity) and take out the radio 1 file but it into a temporary file outside of the whole game itself and then just listen and pwn as many zombies as you can. if it dont work then you did something wrong.
get 1.2.6 :: http://audacity.sourceforge.net/
get 1.2.6 :: http://audacity.sourceforge.net/