controlling movie clips

Hello,

Im trying to make a kind of sound toy, but using video clips(with sound) instead, and making it interactive so the user can change the volume, transparency of the video and basically any other effects that can be applied to a video clip. I suppose the closest thing is like a vj interface, so you can mix video clips with sound, turn them on/off and have them loop in sync. I have had a look at making volume and pan sliders and was wondering if similar code can be used with video to alter the alpha etc, other than that i have nooo idea what to do! can anyone help????? - thanks