Great find, thanks for sharing! Maybe a Hints/Tips thread would be a good idea, as more LD-11’s are getting into the general population, we can all learn from each other. For example, the RIT button also switches between the LOW/HI on Filter #4. The manual makes no reference to this, that I could find.
EDIT: Actually, there is a thread already that may service this purpose:
LD-11 Setup and Operating
This reply was modified 6 years, 11 months ago by KB8LFA. Reason: Adding link to Setup and Operating