Dragging a 5.1 Channel source into an existing track of a 5.1 Multitrack session shouldn't result in a stereo downmix
I haven't used audition for multi-channel editing for long but just noticed I've been bit by this on multiple outputs and have to re-export tons of audio from audition, re-encode it into something usable externally since audition doesn't support any useful multi-channel file formats natively, and re-mux several hundred GB of video as a result
I'm mainly using it to overlay Rifftrax commentary onto movie audio, and don't have a surround system yet aside from the pseudo-surround built into the TV (but figured it'd be better to do everything as 5.1 just in case) and was noticing that it sounded "off" in some cases. There was also the mystery of why ffmpeg was producing massively smaller encodes of Audition output than of original lossless tracks...
It turns out that for some godforsaken reason, if I create a 5.1 channel multitrack session and drag a 5.1 channel file onto the first track, the default behavior is that the first track is stereo (why, and where is the indicator of this other than output levels which I presumed to be related to my device outputs?), and assumes that I want the 5.1 channel audio I'm dragging into it downmixed to stereo (why would this EVER be the case on a 5.1 session?)
This default behavior / layout / whatever you want to call it is possibly the silliest thing I've ever seen out of editing software aside from the weird encrypted software HEVC encoder binaries Premiere buries in its install directories then tries to decrypt into C:\Users\Public\Documents\, fails miserably, and a result is useless for actually encoding anything. Nobody seems to know how to fix that one or wants to so I'm going with filing a request to change this silly behavior.
I'm really seeing less and less of a reason to keep anything but the basic photography subscription since everything else I've tried to use in the past year has either been broken in weird ways or has newly been broken (the HEVC thing).