Many of you probably know about the so called 四｛よ｝つ仮名｛がな｝, じ ぢ ず づ, and that in standard Japanese only two different pronunciations for them exist, that is じ=ぢ=/=ず=づ. However, they used to represent four distinct sounds, something that has been preserved in some regions, especially on Kyushu. See this map: https://en.wikipedia.org/wiki/Yotsugana
Now to my question, my own Japanese is from a 二つ仮名 region so I never had the opportunity of actually learning the other sounds. Therefore I was wondering if any of you know of any recordings, preferably videos, that clearly highlights the different pronunciations.