I added the feature to go from Internal Mic to External mic and vice versa while an Internal Mic is plugged in, but is it really of any use to do that? If there is, I will keep it in the module.
Only advantage is if for some reason you want to quickly switch to your internal mics without messing with the mic plug on cam if one is plugged in, but again, does anyone ever do that?
I can't do anything cool like putting int on one channel and ext on another channel, just the basic disable external mic while it is still plugged in.