Hi Rob,

I have a really nice little 12 channel Mackie mixer as my front end. I mix down to 2 tracks on there and then into PT. Works well. But it only has one bus, so I had to get another puny little mixer (A Behringer Mini MON-800.....you know for 40$, this is one of the coolest little toys I've ever seen, check it out if you've never seen one) to handle the output from the computer.

I was always able to monitor at the input mixer, but I was trying to figure out a way where I didn't have to constantly switch my headphones from being plugged into my front end mixer and my output. Mac's tip did the trick.