Sounds to me like you need a static detector instead of a dynamic one. "This area not empty" instead of "this area changed." I haven't used the machine vision part of Adv. SS, but maybe you can give it a picture of an empty track to compare to, along with a detection area? (might be in the same picture, depending on how it actually works)My current macro is set up to switch to a different scene if the video feed on either side of the main track has changed. While this recognises when my hand crosses through the area, the snail appears to enter the restricted section too slowly for the software to notice the change. Is there a way to improve the accuracy of this set-up? Or are there different macro conditions that might work better?