Can't tell form your post:
Are the flies on separate layers or groups?
You can easily set behaviors or randomize parameters to the individual flies. This assumes your anchro oint is in the center of the fly.
Try disabling all but one while you experiment.
The use of an emitter to create the nine bugs would be a good thing to learn. I'm not sure how you're going to make moving object selectable as buttons in DVDSP, though. Let us know how that works out.
This is my standard sigfile so do not take it personally: "For crying out loud, read the freakin' manual."