This sounds pretty stupid but you might want to check to be absolutely sure that your 1/4″ TRS inputs are pushed in all the way. When we initially tried this we had the same problem only to discover that we needed to be more agressive about plugging in those cables.
Bot other people have reported the same problem. We only know that the audio is pretty good and we have had no problems getting usable audio. We generally record double system sound as a backup though. Eliminates the nervousness.
Sincerely,
Richard Martz
MagicMartz Media
Atlanta, GA
FCP 7
FCP X
Blackmagic Cinema Camera
ADOBE CREATIVE SUITE CC
Premiere Pro
DaVinci Resolve 9.0
MAC 8 core
After Effects
PhotoShop
Illustrator
Sony HD Cameras
24′ Camera Crane with Motorhead
8′ jib arm
20K watts of lighting
Multitrack audio
Teleprompters
Grip Truck/trailer
Location video monitoring
Door and hood mounts
Lots of other Fun Stuff!