The Mac is the "multimedia" monster machine, right? So you'd think this would be easy! Well, it isn't in the slightest. I am running SL on a 2011 iMac. I would like to simply record my vocals over an mp3 music file. I need to be able to hear both my vocals and the music at the same time, while recording. I used to be able to do this on my old Windows comp.... on a Mac, I've never succeeded. Yes, I know about Audacity. It's a non-starter. When set to hardware monitoring (play through), my voice can't be heard along with the music track. It only works when set to software monitoring. Except, there is a latency problem. That is, my vocals have a delay of a fraction of a second, as I sing. This screws everything up. I have played around with the latency settings in Audacity, it does nothing. I've tried a few other programs for the Mac that purport to be able to record vocals over mp3. Some are "karaoke" programs, but none have worked properly, as described above. Surely there must be a way to accomplish this media task on a Mac??