Those are called Shepard tones: <a href="http://en.wikipedia.org/wiki/Shepard_tone">http://en.wikipedia.org/wiki/Shepard_tone</a><br><br>Trivia: one was used in the "endless stairway" part of the Mario 64 video game, to good effect :)<br>
<br><br><br><div class="gmail_quote">On Thu, Feb 25, 2010 at 12:53 PM, <span dir="ltr"><<a href="mailto:fons@kokkinizita.net">fons@kokkinizita.net</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
<div class="im">On Thu, Feb 25, 2010 at 06:30:02PM +0000, andy baxter wrote:<br>
<br>
> Hope this makes sense? Apparently it sounds like a never ending rising<br>
> scale.<br>
<br>
</div>It does. It works best if you use a dense set of notes moving<br>
over a range of several octaves. With just one or a few the<br>
fade-ins/outs at the start/end are quite apparent.<br>
<div class="im"><br>
> If anyone knows of a recording of this, I would be interested to hear<br>
> it; if not I might have a go at making one.<br>
<br>
</div>I once made such a thing, it's fairly easy using Csound<br>
or similar. You just need a note that moves up (or down)<br>
at a constant speed, with a fade-in at the start and a<br>
fade-out at the end, then make it loop, then start a large<br>
number of these at different positions in the cycle.<br>
<br>
Ciao,<br>
<font color="#888888"><br>
--<br>
FA<br>
<br>
O tu, che porte, correndo si ?<br>
E guerra e morte !<br>
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