A number of ways to do this and you're on the right track. Set a variable in variables, have it linked as a global expression so that when variable = true go to presets page. Call that variable upon device selection.
If you are using scrolling text macro than when surce_x_fb=true call the variable ( set variable to true )
Link preset subpage to variable=true.
Alan
"This is a Christian Country,Charlie,founded on Christian values...when you can't put a nativiy scene in front fire house at Christmas time in Nacogdoches Township, something's gone terribly wrong"