Two sounds close enough to trade places: the “y” of yes and the “j” of jump. Swap one for the other and a different word comes out — this page is how to keep them apart, in both directions.
Do not let your tongue touch the ridge; keep it close but gliding smoothly with no stop or friction.
“No touching, no popping! This sound is a glide — the tongue swoops close like a swallow but never lands. Yyy!”Nunzio, when he hears it
You cannot hear your own swap. That is the whole problem.
Nunzio records you reading a sentence, scores every sound in it on your phone — nothing is uploaded — and tells you which of these two actually came out. Nunzio — Accent Coach is coming to the App Store and Google Play.