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Does this popping sound like a digital scratch or a grounding issue hiss. The reason I ask is that with external USB sound cards there is an issue with the number of devices plugged into a single controller which causes a digital popping in the background of music. The other issue could be the targus power supply you are using could be creating a ground loop with your amplifier. The solution is to get a ground loop isolator ($15) or spread the distance between the targus PSU and the amplifier. If these are not the issues can you record the audio and post it for better trouble shooting. Hopefully this helps!
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