What I want to be able to do is play a song on my iPod, play along on my drums, hear both the iPod and my drumming in my headphones, and record same in Audacity. I can do the first three.
Though I can hear in the phones exactly what I want to record, only the drums come through on the recording, not the iPod backing track. I have fiddled around with the mixer every way I can think to. Not sure if this might be the source of the problem, but I am using this gizmo to get the sound from the mixer to my laptop. http://www.musiciansfriend.com/pro-audi ... -interface Obviously, it only has a mono input, though I have the two stereo outputs from the mixer. I thought I would be able to just feed one channel of the mixer in, but maybe that's the problem? Doesn't make a lot of sense though, it's not like the iPod doesn't have a signal in both channels. Besides which, it doesn't matter which channel I feed into the Guitar Link, it still doesn't work.
Any ideas appreciated, ask any questions you need to, thanks!
Posting the solution in case it helps someone else. Problem wasn't any of the things I thought it might be, which is probably why I couldn't see the solution, but my nephew could (though in fairness to me, it did take him quite some time). 
