It’s very similar to playing a brass instrument, basically like a bugle. The easiest way to explain it is that you kind of make “raspberries” with just your lips.

It has been a while since I did it regularly, but from what I remember you blow raspberries, without sticking out your tongue. There was a bit of getting your lips in the proper form.

I used to practice after school while everyone was at work, sometimes I would sit on the living room couch watching after school cartoons and practice the conch during commercials.

My former pulmonologist actually recommended karaoke for me to help keep the airways strong and open.