I do not recommend to buy, poor technical support. Technical support advised using high-quality monitors or professional headphones. Such an experiment was carried out right in the store where I purchased the device - the result is the same! I installed the 2902 v.2.8.40 driver recommended on many audiophile sites, but it is not for UM2, UMC22. The noise from the microphone amplifier disappeared, a line input appeared instead of Audio codec, but at least shout into the microphone, there is no reaction. I found another driver ploytec usb audio asio driver 2.8.45, but it turned out to be without a key. Everything is super, but every 30 seconds a squeak (requires a pill for greed) :))))) In the end, the problem was solved by finding the key
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