After looking around a lot, for several years, this is the only resource I have found that draws on current sophisticated knowledge of Mandarin phonetics to give detailed practical advice on pronunciation – without worrying about regional variations or slang (or worse, worrying about debates between experts on various issues). Slang, and regional variations, and expert debates are all interesting, and there are good books on them. But, being practical, it is very important to me as an intermediate student to focus on standard pronunciation.
Thanks for that!