One thing that's fun, or at least interesting about higher sample rates is that if you look at the recording with a spectrum analysis tool, you see how much stuff is there between 20 and 40Khz, for example. Maybe only a bat can hear it, but it's there.
I actually saw some weird stuff recently, a big spike of activity around 33Khz. No one would hear it, but it bugged me, and I wondered if it would somehow show up as some signal degradation anyway. I traced it down to a bad cable connector. Might have been affecting other things, it just showed up clearly at very high frequencies.
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