I really don't know how you would do that. I've got a couple hundred recordings at least with the X8. Curious. Kangfirmed, many hundreds. And when I say recordings, I mean full recordings, not just a couple minutes of stuff. It can mix down inputs, say 3/4 to mix, and 5/6 to a mix, but I have no knowledge of you being able to use it to import tracks to mix. Like I said, many hundreds on my X8 in every possible configuration. From cell phone calls, mixminus, many matrix shows, boards, etc. Thanks to a member here who passed it off to me right when it came out. Upgrade the firmware and I can say it just works so hard for me. I've taken it to ridiculous environments and taped some amazing things with it, but a mix down unit it is not. YMMV. But I don't think so. I highly recommend the big dead cat if you are using internal mics which has saved me butt and also let me be spontaneous with it as well for weird field recordings. Enjoy it, and if you have any questions about it, please ask, I've pretty much mastered it and would be glad to be a resource to anyone.
To know how much I bond with it, I was actually mugged one night coming out of a show. It was a horrible scene. I got tackled, punched and got really messed up. I went back the next day and found it in the gutter. It was still recording and I heard the whole thing and the after talk about what happened and the ditching. Yes, I bond with my X8 a lot. It's been through so much more than even that.