Same, the stereo mix is useless to me too. I am definitely getting a stereo file with more than 2 ISOs, and all other stereo features turned off. Maybe it’s a bug in the way Audacity is handling them. As long as I can just split it and get ISOs 1-2 back as separate tracks, I guess it’s fine, it just seems like weird unexpected behavior on a device that otherwise is pretty intuitive to use.