It sounds like you have FLDigi configured to use the laptop's speaker and microphone channels, rather than the Signalink USB.
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Here is a snip of my FLDigi soundcard configuration. Yours should be similar. Note that it uses the speaker and mic OF THE USB AUDIO DEVICE, not the Realtek soundcard in the computer. If the USB soundcard driver does not appear, you may have a missing driver.
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