I think you have to use good headphones to do this properly.
I can hear them all except the last, but there are a couple weird things I noticed:
Anything on this list above 16.7 khz sounds lower in pitch to me than any of the tones actually lower than it. I think I might actually be hearing a harmonic or something. Anyone else notice this? To me, the highest, 21.1 khz, actually sounds like the lowest tone on the list. (Or it could be the headphones)
I've really got to crank the volume to hear the tones above 16.7 khz clearly.
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