I have been practicing bamboo flute for 6 months. I initially got a nice beautiful low notes but the high notes were a problem. After that I changed my finger positions and it affected my sound but i sticked to it. Now I can produce low notes clearly and high notes clear but it is only if I place my flute little tilted inwards. Also I can hear a initial puu sound before I can touch the high register.
I see many videos and tutorials and tried to emulate them. But when I tend to play long sounds particularly high notes, I give too much air and pressure. After that I physically tried and frustrated. If some experienced people can enlighten me about the causes of this and how to overcome , It will be greatly helpful.. I guess it is my lip position and mood that is affecting the tone.