ericleven created the topic: Apple Voice Memos, Soundtrack Pro, and Foxonix
I might be the only person who tripped up on this, but it snagged me the first time I tried to use Foxonix, so I thought I'd share it.
I used Apple's Soundtrack Pro to resample audio to 12khz that was sent to me via text message on an iPhone. The file was originally recorded using the iPhone's built-in Voice Memos App. After resampling, I saved the file and tried to compile it in the Sonix Developer Program, but was given an error with no explanation.
It turns out that Soundtrack Pro was treating the audio file (both the original voice memo and the resampled version) as Center channel audio; I assume as part of a 5.1 mix. No idea why.
When I opened a new mono channel file and copied and pasted the original audio into it, everything went as expected from there.