Two sounds close enough to trade places: the “b” of bed and the “v” of van. Swap one for the other and a different word comes out — this page is how to keep them apart, in both directions.
Close both lips completely, build up air, and release with a small pop instead of letting air leak through.
“The lips must CLOSE, bello — completely, like a jar of nonna's sauce! Then pop! No leaking air.”Nunzio, when he hears it
Do not close both lips; rest your top teeth on your bottom lip and let voiced air flow continuously.
“You pop like a cork when you should buzz like a bee! Teeth on the bottom lip, air flowing, no closing!”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.