I know it's slightly different than what you were instructing here, but I really liked your attention to detail and clarity. Perhaps you could shed some light on the trill that is so often difficult for us gringos.
Personally, I've finally got the fundamentals of the trill down, however I'm having difficulty getting the proper pronunciation of syllables preceding and following the trill. For instance words like "aburrido" and "burro" are extremely difficult, as are words such as "desarrollar."
If anyone has ANY suggestions on how to move forward now that I finally have some semblance of a trill? Thank you!