Canon a620 movies

Ive been trying the movie mode on my a620 and despite the increase in
picture quality due to the digic 2 I am disappointed by the sound quality
which is poor compared to my previous a80 and the noise from the cameras
electronics is much louder. perhaps canon have reduced the mic's sensitivity
due to more noise from the new digic chip as it sounds muffled. I was hoping
to take better videos with this especially indoors where my old Hi-8
camcorder is poor. Anyone know a reasonable priced digital camcorder that
does sharp low noise movies indoors. I think Ill have to upgrade my
camcorder after all! Or is there sortware available that will clean up the
620s sound a bit?