If you have two people and


If you have two people and need two microphones, then you need two MONO microphones. Stereo mics are great for recording soundscapes with lots of stereo sources, but one mouth to two mic channels is pointless and prone to so many problems with imaging, nobody ever does it! 


As soon as you outgrow the basic audio facilities on a camera, stop using them and do what Ed says – get a separate recorder with proper mic inputs on professional connectors and do it professionally. 3.5mm mic connectors with a pile of adaptors are always a risk. The USB socket is an output isn't it? I've never heard of any camera being able to use them as inputs? Even if it was possible, and there was a hidden menu, then it would also cut off the normal inputs.

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