Gearbox noise

This only happens when i change gear above 6k revs, so right in the power band.
As soon as i drop the clutch to change, i can hear a rattly, ticaticatic kinda noise.

doesnt happen any other time, only when giving it beans and right in the power band. box feels nice ans tight, no notching and no noises any other time at all.

any ideas? normal? syncros working over time or dying?
 
Normal. From what I remember reading in the past, it's the little acoustic ''trumpet'' on the induction setup.