How loud is the Canon Scoopic 16M? What's needed for sound

[msp1518]

How loud is this camera? The 16M. If crystal synced, just how difficult would it be to shoot sound? In a room, shooting dialog = insanely impossible?

I'd love to move up to 16mm from super8. No doubt about it. But... if I go 16mm, I really need to be able to shoot sound.