Just like to thank everybody who replied to my students sound problems quite a while ago. It has taken me quite a while to sort them out. But have had some limited success. They had shot some of the scenes with different cameras so I could sync the sound of the Sony PD150 to the clips captured on the Sony DSR 200.
With the Sony DSR Clips I still had to use I had a 50% improvement by experimenting with everybody's suggestions and the one that worked was the low pass filter and the 3 band graphic EQ by sweeping each clip and keyframing at the beginning and the end then listened for the best setting imbetween.
The problem with the DSR as was suggested by you and was found to be a lose solderd joint internally on the microphone. But both cameras do still have hiss as I have read when investigating the problem. I now need to get the college to invest in a mixer so we can use a boom mic.
Thanks again to everybody who helped. It was very much appreciated by myself and my students here in the uk
Thanks again