Not sure if it was posted before, but I found this free software really easy to use and worked great on burning in my 3012LF.
I tried audacity but it was creating random pops in the wav file. I also had the issue with playing the wav file, at the beginning of the track on repeat it would pop so I wanted to use something that would just create a constant freq I could use for 12hrs, and this was it:
http://download.cnet.com/BurninwaveGene ... ag=mncol;2