Cool idea, but not applicable to our scenario. People would step in and there would be a 3-2-1 count and then step out. There was no flash to sync against. And

Cool idea, but not applicable to our scenario. People would step in and there would be a 3-2-1 count and then step out. There was no flash to sync against. And even if there was, if the devices are all running at different speeds, the sync is moot.