FWIW - As I mentioned earlier we've been posting some Android Monitor details in the X6 forum. IF you have interest in understanding how the Android is using the OEM MIC versus the Android MIC, visit the link below starting with Post #85.
jvirgi has been doing some testing and the results are interesting and helpful. I'm going to recreate the testing procedure he provided to confirm the results...
https://www.xbimmers.com/forums/show....php?t=1715727