Quote Originally Posted by zadok View Post
Overlay seems to be something which is mainly used for security camera systems etc. TV signal overlay chips cost far more from what I can gather, although (I think) I've worked out how to do it with just the basic chip. What proportion of the demand would you expect to require overlay - say half?
This might just be my personal preference but I think more than half. Things like Caller ID, doorbell, car entering driveway and other messages should overlay whatever channel is currently selected so there's no additional action required by the user, while things like your power monitor can use their own channel.