I have a problem related to>Noise>Secondary gear sound

Category name: Noise

Sound description:

Sound best heared with a vehicle speed between 60kph to 90kph while slowly accelerating. When releasing the gas pedal, sound normally is getting smaller, give throttle again, the sound comes back.

The sound is like a whistlesound. The frequency of the sound goes up with vehicle speed.
This is a normal sound from the CVT which comes from the secondary gear running into the pinion shaft gear.

Example:
 

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