Achieving "0dB" Rx noise level.

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Achieving "0dB" Rx noise level.

I am learning how to use WSJT 9.02. I have purchased and connected the SignaLink USB external sound card to my desktop. I noticed that the Rx noise level always hovers around –1 to –3 dB and the User’s Guide specifies that “0 dB” is what should be achieved. When opening the Options | Rx volume control from the SpecJT window I get an error message “There is a problem with your sound hardware. To install mixer devices… etc.” When I follow the instructions it shows that all sound devices are working properly.
Has anyone else encountered this problem?
73 de N9UYC