Hey, quick question... I'm using an Allen and Heath ZED 428 for some recording. I know I can only get at best a stereo output via usb but I can't get ProTools to recognize it. I start with my computer off, hook everything up and then turn it on but all it will list in the playback engine setup is a vague reference and when I select that it doesn't work. Can't setup the I/O... nothing. Help.