Neat! Those comments taught me. In further checking, I found the sound amplifier I WAS using was the culprit. In replacing that, all "noise" is gone. And being a "purist", I still want to sparingly use the SD-80. Anybody know where I can get a driver for that? I'm on Windows 10 Pro, 64 bit. None of the "available" ones on the internet work. But I did find one for my MAC PRO, but I need one for the PC so as to work "in tandem" with the audio. JZ


Having fun!