I have tried Focusrite Scarlett 2i2. It works fine with the rename. Also you can create an aggregate to just use your direct line input if it is separate from your audio output. Just use a 1/4" to 3.5mm mono adapter. Tried on a MacPro, but hadn't been able to get it working on a macbook. Also tried with a ProFire 2626 with various settings, but couldn't get it to work, I'm guessing because it has too many inputs, which is a shame, because it's a solid interface as well. Has anybody gotten multiplayer working this way? Do you need to setup two different interfaces? Do you need to rename a second aggregate?