[ugurnot]

The tone I'm referring to is the alternation between F#3 and F#4. I think your observation about the Shepard tone is valid. For the talking piano effect, I remember trying to play it on guitar to make it sound like "Robot Rock". I suspect this is in relation to Tethard's example of accentuation by spectral contrast, but that was a long shot to include.

Well, the audio area is full of masters and experts. I make no claim to be an expert, so you can ignore this writing as you prefer.