Need Recording Help

So I've decided to use Hiveswap as an excuse to finally try let's playing. I had everything set up and ready, but I'm running into one major problem: Whenever I start recoding my voice, the game's audio turns to crap. Oddly enough, this seems to be a problem specific to Hiveswap, as I tested a few other games and none of them had this problem. If any of you know anything about recording things, could you help me figure out what's going on, or at least point me to somewhere I can get help? Nothing I try seems to work and I have no idea where to turn to on this.