You will want each mic to go through a pre-amp to get a nice signal level into the AXE. I would consider a two-channel pre-amp for convenience, with phantom power if you want to run the condensers. Run a mic into each of the pre-amp channels, and then run each channel into its own input on the AXE. Then you need to decide whether you are going to process either signal at all in the AXE, or just send them out the USB unprocessed to your recorder. At the very least, I would consider using the excellent gates on the AXE Input blocks.