Here are some measurements I’ve just made. I’ve included the old Griffin iMic (stereo in/out, switchable line/mic inputs.) as it performs well against the UM2. It may be available at very low cost second hand, but it has no control knobs or direct monitoring. Works fine with the JackTrip app though. I also measured my UM2 - not quite as good as those you’ve measured @miked, which I assume may be down to my older machine.
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Thanks, @rebholland, I’ve added these to the list. Good point about how your computer’s performance can also impact things!