I hear a Db when I play a C!

Does anybody knows why I hear a Db when I play a C on my Keyboard in Dorico 5.1 ?
Thanks for an eventual answer which will be wonderful !

You have a sample rate mismatch. Make sure the rate specified in Device Setup in Dorico matches your system sample rate.

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Thank you. I resolved the problem. I didn’t allowed System software from UA after updating !
Have a great day.

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