DO NOT record sound using EOS 5D or 7D without reading this first.

Please note the cannon EOS 7D has automatic GAIN adjustment that you cannot get around in the software. You need to shoot and record on a second system for audio, or you need to research the web for the cable to bypass the 7D AGC.

Canon 7D/T2i AGC Bypass Trick – YouTube

AGC Disabler Cable