Pretty simple question - can the VG20 record from both it's mic and an external mic at the same time (presumably to separate channels)?

Or do you have to choose one or the other?

Just one Option at the time, as soon you plug in an external mic, internal is switching off.
I found out the VG 20 Microphone channel has a Delay on the Headpone Output ,dont know why...

I suspect the delay is from the DSP used for audio.

A DSP is not cheap and maybe needed with with the 5 CH Surround. But for 2 channel Stereo wrong design, simply pass trough should be possible.

Thank you gentlemen, that's good to know.