On take off on the Vulcan the correct response was 1,3 and 4 on 2 off. This was because no 2 engine air had no pressure regulation to allow cross feed starts to the other engines. One day when very inexperienced I got the on and off positions mixed up although my responses were correct. The net result was the bootstrap turbine oversped on full throttle on take off and we all nearly blew out our ear drums. I was not popular and was made to sit at another table to eat the post flight meal.
ACW