I've run into an FCP X (or camcorder) problem that has me baffled. Maybe somebody can help me understand. I'm shooting with a Canon XA10. Two mikes coming into the XLR connectors, and the XA10 is set to place each on its own track. I was shooting a rehearsal for a performance, and whenever I looked at the XA10 audio display I noticed nothing unusual. Each channel had activity. When I brought the clips into FCP X (the .3 version) all the clips but one had two separate audio channels, as expected. FCP X displayed each channel as "Mono (channel-1)" or "Mono (channel-2)," as expected. But one clip has only one channel, and that channel's marked as "<clip name> -a1." The clip immediately before it has 2 channels, and the clip immediately after it also has 2 channels. The time between clips was only a matter of seconds. If everything after the one-channel clip stayed one-channel, then I'd be looking to something I did, or something that failed somewhere along the line. But everything after that (and on other days, with the same mikes) was fine; always the proper two channels. I grabbed a ClipWrap trial and converted directly from the .mts file, in case FCP X had somehow hiccuped on the import. No difference -- still just the one channel. I haven't simulated an accidental mike disconnect (or level-set-to-zero) to see what FCP X does with a blank audio channel. I did re-import the clip, making sure that the "Remove silent channels" setting wasn't ticked. No difference. I'll do more testing with the mikes and the XA10, but I have no memory of making any level or connector changes before the next clip, which, as I've said, is just fine. If I did something I can't remember doing, then I also undid it and can't remember doing that either. That seems unlikely to me. The performance is in a few days and I'd be more relaxed shooting if I had a good idea about what went wrong on that one clip but on no other. Any ideas?