Those are called Shepard tones: http://en.wikipedia.org/wiki/Shepard_tone

Trivia: one was used in the "endless stairway" part of the Mario 64 video game, to good effect :)



On Thu, Feb 25, 2010 at 12:53 PM, <fons@kokkinizita.net> wrote:
On Thu, Feb 25, 2010 at 06:30:02PM +0000, andy baxter wrote:

> Hope this makes sense? Apparently it sounds like a never ending rising
> scale.

It does. It works best if you use a dense set of notes moving
over a range of several octaves. With just one or a few the
fade-ins/outs at the start/end are quite apparent.

> If anyone knows of a recording of this, I would be interested to hear
> it; if not I might have a go at making one.

I once made such a thing, it's fairly easy using Csound
or similar. You just need a note that moves up (or down)
at a constant speed, with a fade-in at the start and a
fade-out at the end, then make it loop, then start a large
number of these at different positions in the cycle.

Ciao,

--
FA

O tu, che porte, correndo si ?
E guerra e morte !
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