Shirabe
促音 そくおん
  • noun (common) (futsuumeishi)
English JMdict
1
noun (common) (futsuumeishi) linguistics geminate consonant (small "tsu" in Japanese)
拗音(ゃ ゅ ょ)と促音(っ)の出し方も、加えていただけると参考になるかもしれません。
I think it might be useful if you could add how to output the diphthongs (with small ya/yu/yo) and geminate consonants (with small tsu).

漢字 kanji used