Now here are some words about key features. The first one is that my tongue throughout the whole phrase LIES DOWN the tip touching the insides of the LOWER FRONT TEETH. It might sound strange but it is. The sound comes mainly from the point inbetween the roof of the mouth (right near the alveolar ridge, which feels like a hard bump right behind your upper front teeth) and the front part of the tongue bent upwards toward it. Sometimes they touch each other to make plosive sounds, sometimes they form a small chink to produce fricative sounds. I call it the lower position. There is also the upper position when the tip touches the ridge right behind the top teeth. But I don't use any of those sounds in this phrase. Practice it a bit after the mp3 file.
You mean the tongue is lying down by default but moves up to the alveolar ridge to make the sounds right?