I just spent about three hours with it, read manuals etc. I’ve variously tried to solve this problem before, but hadn’t tested the result until the next shoot. So, I thought that “dual stereo” mode is what I was looking for, but what that seems to do is to record two individual mono channels, and then create a new file of 2 mono channels at a lower db rating. There’s a “4-channel” mode, but that seems to only allow you to designate inputs 1 and 2 to the same single mono status, while allowing a mini-jack to record extra audio channels through the 3rd and 4th input. It’s really nuts to me, and I’ve been using this thing for a long time now under many assurances that it would give me professional audio under normal circumstances. I really do hope I’m somehow mistaken, but I’ve run out of options personally.
Re – specific test methods: The file it makes is 2-channel. Mic 1 on the Left, Mic 2 on the Right. If it were what I want, it’d be a 4-channel audio file, the first two comprising channel 1, the last two comprising channel 2.