Make sure you have the program sndfile-info installed on your computer (I am assuming Linux). You run it from the terminal, giving it the name of a file to report information about. Run it on a representative file from each device, and post the output here.
I had read, tested and tried a lot of things for about two hours and nothing.
I don’t know how but after restarting my computer, creating the projects again, changing the file directories…everything’s fine now.
I’m running into this too, and I have another piece of the puzzle, but no answer yet. The file has 5 channels. Audition works fine, before and after import but placing it on the timeline is silent. Running on 4.1.0 on Arch.
Ah. No, it’s from a Sound Devices 664. I’m not sure how the recordist laid out the channels, but there are only two files in 50 that have this problem.
The obvious answer was the answer, in my case. Opened the two problem files in Audacity, and found that channel one was empty. Removed it, exported, and they now work. So a mono track in Ardour is just pulling from channel one? I had tried the make region mono option earlier, but it didn’t seem to work.
The ‘Make Mono Region’ option will split each channel to an individual mono region, but these regions will appear in the region list in the right hand sidebar, and have to be manually placed in the session still.