Hi Paul A click track does not have to be an actual click or electronic beep we use simple drum tracks GENERATED from the PC. It sounds just like drums but keeps perfect time. These are then replaced with a proper drum track if need be or enhanced to a proper full generated drum track with all the fills etc.

Hi Matt you keep referring to a .wav file as if it is something special or different from other files. A wav is just an uncompressed digital sound file. All Windows compatable music software creates wav files. Here is a link to explain exactly what it is.
http://en.wikipedia.org/wiki/WAV

As stated earlier a click is designed as a ref point...does not mean you have to sound mechanical or robotic it just makes sure you are in time with the song. Modern studios record piecemeal and snippets are cut from several takes so the best bits can be strung together to form a track. It saves time waiting for that perfect performance which might not come till take 19. Without a click the timing to splice these together would be off and it would be impossible to cut and dice accurately. The parts would never match.

http://www.soundclick.com/bands/songInfo.cfm?bandID=687727&songID=5238055