After my firmware update today, I also found out by surprise that my Galaxy Tab recorded audio from ground station. Base on the sound recording being stored inside the tablet, I believe your question regarding external mic hooked up directly to tablet should store sound file within the tablet. In regards to your comment being "in a pinch", if you have to count moments from starting up your RC, then your copter, then wait for warm up and connection, GPS, and such, perhaps it will be longer than "a pinch". You may be better off turning on your tablet, use the external mic and record direct into your tablet, unless you don't mind waiting a few minutes. My question is, unless you've already figured this out: How to export the video and audio together? I found the audio file in the tablet, but couldn't find the video file as it is in .info file.