What I can't figure out from the manual is whether "audio level" set at "A" for automatic will also automatically control levels when using the XLR ports. The manual's only mention of this setting refers to the built-in mic.
We've been using both XLRs: one to a mic on the camera the other to a mic on a boom. It's just too hard for the camera operator to be monitoring levels when audio level is set to manual so we were hoping and assuming that set at automatic we would also be getting some level control of these two mics.
Set to auto works with either the on board mic or XLR's provided you have XLR activated in the menu. The fault with Canon's audio auto level mode is that it affects both channels as one. There's no way to set it for independent channels. Meaning for instance, you have your main audio source on one channel... & secondary audio on the other... if sound source for the secondary audio channel rises considerably for whatever reason, it's going to affect & lower your main channel. Stupid design, but it is what it is.