I have the 907 but only use it to record my son's baby talk. It will not generate a strong enough signal for line-in on a minidisc. At least it doesn't for my MD, Sony MZ-R909. You will defintiely want a battery box and probably a pream if you're going to record in high SPL situations. As far as it's usefulness for a camcorder, it seems fine for conversation so perhaps. My camcorder only has the built-in mic and no external jack.