The FP24 and the Sony PD150 DV Camera don't like each other. There is a strange distortion when I use the two together. Any ideas?
Yes. The Sony audio input circuit design is less than optimal. It does not operate well when fed by an output circuit that is impedance-balanced like the FP24.
One solution is to insert a 600 ohm/600 ohm in-line isolation transformer between the FP24 output and the Sony input. Such a transformer available is the model ProCo ITX; available from: http://www.markertek.com
More information can be found at: http://www.sounddevices.com/tech/pd150.htm