Great answers from everyone! I always knew I was a bit different for having music from outside the game going at the same time. I do hear some sounds from my game while I'm listening to my music. I have the master volume, voices, and sound effects maxed, while I have the others muted. I use the volume controls on my keyboard to control the volume for the game and I use the volume controls in my music apps to set those and then balance the whole mess so I can listen to both. I would love it if my sims and I could listen to the same music at the same time, but custom music, in my game at least, doesn't work.
