special effect

[Hairy Harry]

The Shepard Tone idea is even more fun if you use notch VCF in
place of the sine wave VCOs... this gives the everlasting phase/flange
sound...

Also very nice with BPF and noise source.

To hear a similar (or maybe actual I don't know how they did it...)
effect... the end of "Echoes" on the Pink Floyd album "Meddle".

H^) harry


>From: Magnus Danielson <cfmd at swipnet.se>
>To: J.Proveniers at orga.nl
>CC: synth-diy at node12b53.a2000.nl
>Subject: Re: special effect
>Date: Tue, 22 Aug 2000 09:27:57 +0200
>
>From: Jeroen Proveniers <J.Proveniers at orga.nl>
>Subject: special effect
>Date: Tue, 22 Aug 2000 08:32:49 +0200
>
> > Hello,
>
>Hi!
>
> > A few years ago I read in an article about some weird effect, probably 
>named
> > after its inventor, that gives the illusion of an endlessly rising tone. 
>It
> > worked by 'cutting and pasting' higher harmonics to lower. I'm curious 
>how
> > that sounds and how it's actually made.
>
>It's the Shepards tone. It it the continous form of a little game that Bach
>played with discrete notes many, many years ago. The Shepards tone consist 
>of
>a number of sines (8 has occured) spaced evenly out 1 octave away. These 
>tones
>either rises or falls. The amplitude of a sine is raised as the sine is
>approaching the middle, and then the amplitude is reduced as it passes away
>from the middle. Modulation wise you have a sawtooth for oscillator CV and 
>a
>triangle (with the same period time, in sync with each other) as the VCA 
>expo
>CV signal. Paia at least used to have a kit for creating these waveforms.
>Also, as I recall it, the description for it also said alot about the 
>theory.
>
>I don't have a sample around but if you where here I would play a test CD
>containing it.
>
>Cheers,
>Magnus
>

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