Hi, I am new to max, but I am very interested in controlling layers of sound with video. What exactly does your patch do?

it just compare a frame and the "frame-1 frame", and evaluate the number of changed pixels then convert it in 0-255 and send it to a control change (on/off if >threshold, or a scaling between 0-127) if i remember well, the midi mapping is not optimal. I will made a more efficient later. cheers

Caroline, check out vizzable suite at the maxforlive.com site, you can sequence sound and video images with this, works well but can be a bit unstable sometimes, well worth a look

cheers Al