One issue that someone obliquely mentioned in the various replies that I feel requires greater emphasis, is that the SignaLink USB box is, first and foremost, a sound "card" and as such requires a great deal more current than a typical USB device and should be plugged into a *powered* USB hub. Granted, the power supplies for various powered USB hubs are likely to be noisy (from the perspective of us hams, anyway), and may need further treatment (chokes, bypass capacitors, etc.). But if your SignaLink USB is plugged directly into your laptop or desktop, know that it's drawing more current than the USB (<3.0) spec allows, and that may be a significant contributor to the noise problems being reported in this thread.
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