Hi Psychmark,
Thank you for your question, and I'm sorry that you didn't get an answer until now. Not sure what happened exactly, but somehow we overlooked it.
Generally speaking, you'll get a faster response if you call our Cinema EOS hotline at 1-855-CINE-EOS, or you can email us at cinemaeos@cits.canon.com, so I would recommend those options if dealing with a time-sensitive matter. That said, we do strive to respond to forum posts more promptly than we did here, and again I apologize about the delay in our response.
As you may have seen seen in the menu under the audio headings, you can select 4K RAW CHANNELS and then select which channels are active.
Your video editing program might still see blank audio channels though, and you might need to make additional adjustments to the footage after it has been imported.
In Premiere, you should be able to right click the footage in the Project panel and select MODIFY - INTERPRET FOOTAGE. Under the audio channels tab you can make adjustments to how Premiere handles the audio channels.
If that doesn't work, you might need to bring in the footage into a new sequence and delete the blank audio layers before bringing the footage into your master squence. Beyond that, you may wish to check with Adobe for additional recommendations about Premiere-specific adjustments to suit your workflow.
