1stly......This forum is awesome. I usually find answers here to all my many questions. But this time I am completely stumped. (Situation): I am Using Logic Pro 8 on a G5 running OS X 10.4.11 Tiger. Runs Flawless. I have 2 interfaces that I would love to combine into an aggregate. I have a MBox 2 that works perfectly. I also have a Behringer Xenyx 502USB mixer that also works perfectly with my system using the usb codec. Both pieces have more than acceptable latency and sound quality for my purposes I would like to use my outboard harmonizer as I/0. I cant seem to find anyway to make this happen other than aggregate audio. Can anybody here provide me with a step by step for this process?? I have looked all over the internet and I have seen the directions that pop up in the 1st 100 pages on google...i am missing something. i have tried every combination of placing the 2 units together in the aggregate window but to no avail. Both pieces work separately, but I cannot get them to work as a team...... Can anybody Help me?