**Spoiler**
Okay, I was up until 2 AM getting off this stinking planet, but I finally did it. If you have the voice recorder, the key is talking to the HK droid (didn't Revan build HK47? Where did this one come from?). He says he knows the code, but the lock is voice coded (or something). If you follow the right conversation path, he'll replay the last words of the guy who's voice you need. After that you should be able to convince him to say the code in that guy's voice. Then you just go to the door and use the recorder and it should open. Hopefully that made sense, I'm really tired...just remember to talk to the droid, the rest should become apparent pretty quick.
