Strange noise in first gear even whit clutch pedal pushed down?
 

im in first gear and i accelerate ...and a windy noise like is heard and it becomes more obvious if i push the clutch pedal down couse no more reving endgine noise.if i put it in neutral...no more noise...if i put it back in first wile still having a bit of speed and the clutch pedal still pushed down... the noise apears again.... car is an audi tt 1999 1.8