[gabereiser]

people are hearing what you hear. It's the simultaneous tones, one low, one high, low in the left, high in the right. It's not that it's panning (one at a time), it's together (or within ms of each other when mixed with other techniques). Once you understand this, then the concept of just flipping it makes even more sense. Then get creative and flippity floppity the high/low left/right dance.

[Groxx]

That's what the sounds are actually doing though, so what would the illusion be?

[gabereiser]

the illusion is it's perceived as the "same" note/tone. It's not, and when you dig, you can tell it's not, but when you're casually listening, your brain here's a "fuller" note for some reason. The "fuller" comes from the two octaves being played simultaneously in your seperate ear holes.

Like sleight-of-hand, you know it's there but you can't quite discern it at the time and are gladly surprised by it but you know it's not real magic.

[Groxx]

This sounds like it might be conflating stuff like vibrato (human-fast variation in pitch) or even faster. The illusion in the post and on the Wikipedia page involves changing the tone only four times per second, there's no claims at all about both tones blending together or producing only a single note.

Both are quite clear about different ears hearing different things, and hearing two or more tones.

[gabereiser]

I’m referring to the perceived sounds. They aren’t blended together. I’m fully aware of what vibrato is and what the post is talking about in terms of changing tone, half tones, auditory phantoms, trichords, and the octave illusion. The Wikipedia page details the phenomenon with stepping and alternating but it’s not the end of it. Various intervals have been tested. Us musicians have been playing with this for a while now.

[Groxx]

This whole thread is about the octave illusion, which is a very specific subset of psychoacoustics, and AFAICT the post accurately summarizes it as:

>There is one octave between the tones. If the alternation is short enough, you will hear the higher tone in one ear and the lower in the other.

No changes. Handedness of sounds that already exist.

[ilyt]

I don't hear that. I hear constant low tone in both ears with only high one bouncing around (i.e the ear where high is is perceiving low one even if it is not there)

[Groxx]

With the Wikipedia sample, I kinda suspect the central low note is the same phenomenon as binaural beats - 400hz and 800hz constructively interfere to produce 400hz. There is no 400hz on the high side, but we perceive interference even though there is none.

Which means it should disappear or produce a third tone if it wasn't an exact doubling. I haven't hunted down a sample to test though.