When playing my Recorder I found out that each note was half tone (sharp) up... I was wondering if this is a problem with the flute, or with my technique of blowing... 

I have also noticed that **when playing it really gently the tone is correct**, the thing is that this way, I lose some of the dynamics and color of the instrument.

Is the problem my playing or the recorder? is there a way to "down tune" the recorder a half tone down (to make it flat all the way) ?