6.6 Hz I'm actually reasonably satisfied with that, given that I don't play a musical instrument and haven't done any singing in a couple of years. I'm sure I could get higher if I focussed more, but I couldn't be arsed.
I was wondering about this too. I think that the closer the sound comes to a pure sine wave, the more difficult it would be to discern small differences in frequency. Some people have mentioned using overtones to help them; a really good listening setup or pair of headphones might actually minimize these overtones and make it more difficult to hear the frequency differences.
It was sarcastic in that it deliberately ignored your obvious sarcasm. It's a level 6 sarcasm technique; you must not have learned it yet.
got 1.8ish, then 1.2ish after turning my volume up a bit more. I suppose if I focus and replay the tones more often I could get it under 1 but that's about it =/
Which is in most cases indistinguishable from the level one saving-face technique colloquially known as "dude i was joking lol!".