Hello, I want to ask a question about the ventilation of suona.

When you take a deep breath and feel that your breath is running out, bulge your cheeks and fill your mouth with air. Then use your cheek to trap the air in the whistle. At the same time, inhale quickly through your nose. Just blow with your mouth. Be careful not to spit in your mouth for the first breath, otherwise it won't last long. There is also a lighter whistle. Under normal circumstances, I can call for ten minutes in a row.