Velocity problem just with continuous sound instrument in sibelius

Hello everyone

I have a problem with the velocity (even after adjusting curve in v49 editor), just in case i use every instrument that has continuous sound, like violin family, brasses, winds.... i can obtain just sounds without control on velocity.
But with keyboards, guitars and persecutions the velocity works well. Do you Know how can i resolve this problem?
I use sibelius 7
Thank you
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