Low C Flute

[fluting4ever]

Hi, I had a question. Recently, I've realized that after I practice for a while (over an hour, and i play the low C, the sound doesn't come out.) I can play the harmonics with the fingering as well as every other note but the Low C and consequently, the low B as well. I don't think it's a leak or pad problem since the other notes work and the harmonics can be played with the fingering. So, I don't know what's wrong with it. I can play the notes when I warm up but then when I try to play it again, after practicing for a few hours, I can't play the C and B anymore. Does anyone know what to do?

[Zevang]

IMHO, it's just embouchure fatigue. When it happens to you, after some time of practice, try to relax and focus the airstream. When you get tired the muscles loose a bit of the control you have when you begin practice.