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 Forum index » Clavia Nord Modular » G2 Patches - Experimental
Shepard tone (my first G2 patch)
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jamos



Joined: Jun 01, 2004
Posts: 470
Location: Eugene, Oregon, USA
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G2 patch files: 36

PostPosted: Tue Jun 22, 2004 12:44 pm    Post subject: Shepard tone (my first G2 patch) Reply with quote  Mark this post and the followings unread

A Shepard tone is an audio illusion that continously rises or falls in pitch. For more details on on Shepard tones, see http://www.mtsu.edu/~jnm2b/Shepard.html.

The key to doing this on a synth is the creation of phase-locked sawtooth and triangle LFO waves, with the phases of the various waves spread evenly across 360 degrees. I used LFO C to generate the phase-locked sawtooths, and then used rectifers and level convertors to convert these to triangle waves. Static shapers are used to round the triangle slightly, so that partials enter the mix smoothly.


Shepard Tone.pch2
 Description:
A continuously rising or falling tone.

Download
 Filename:  Shepard Tone.pch2
 Filesize:  4.67 KB
 Downloaded:  1505 Time(s)

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mosc
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Joined: Jan 31, 2003
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Location: Allentown, PA
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PostPosted: Tue Jun 22, 2004 3:02 pm    Post subject: Reply with quote  Mark this post and the followings unread

Nice patch. Tt's a good one to keep in the synth for demos. You know, when you are showing off your gear and can't think of anything sparkling to say. Very Happy

I tried this on the original NM but didn't get it. Crying or Very sad

Thanks... Very Happy
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jamos



Joined: Jun 01, 2004
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Location: Eugene, Oregon, USA
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G2 patch files: 36

PostPosted: Tue Jun 22, 2004 3:16 pm    Post subject: Reply with quote  Mark this post and the followings unread

I actually remember reading something once about a composer who used a falling Shepard tone in a piece - something about the nightmares of the bombardier on the Enola Gay - but it still seems to me to be of [i]very[/i] limited practical value :')
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mosc
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PostPosted: Tue Jun 22, 2004 3:30 pm    Post subject: Reply with quote  Mark this post and the followings unread

Well, I'm a bit wacked out on medication now. It seems the challenge for making it useful would be to make this polyphonic - whatever that would mean in this context. At least something you can play - from a keyboard fr'instance.
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ian-s



Joined: Apr 01, 2004
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Location: Auckland, New Zealand
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PostPosted: Tue Jun 22, 2004 4:24 pm    Post subject: Reply with quote  Mark this post and the followings unread

Nice work. Like Howard, I have tried this in the past (with csound/softsynths etc) but without the same degree of success. I think YMO used it (to nice effect) on an album in the early 80's.

On the subject, while too trivial for it's own topic, here is a barberpole flanger. It uses nothing more than the FreqShifter with delayed feedback. I have to admit that I tend to overuse the FreqShifter, I just love the 60's analogue sound it gives to everything.


BarberPoleFlange.pch2
 Description:
ever upward/downward sweeping flanger

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 Filename:  BarberPoleFlange.pch2
 Filesize:  1.05 KB
 Downloaded:  1145 Time(s)

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jamos



Joined: Jun 01, 2004
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PostPosted: Tue Jun 22, 2004 4:52 pm    Post subject: Reply with quote  Mark this post and the followings unread

Oh, I like that. And useful, too. Never knew a frequency shifter could be used like that.

Boy, do I have a lot to learn :')
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mosc
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PostPosted: Tue Jun 22, 2004 4:58 pm    Post subject: Reply with quote  Mark this post and the followings unread

This is too neat for non G2 owners.

Here's an mp3 of Jamos' Shepard Tone.


shepard-tone.mp3
 Description:
Shepard Tone

patch by James Johnson
recording by Howard Moscovitz

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 Filename:  shepard-tone.mp3
 Filesize:  1.6 MB
 Downloaded:  1273 Time(s)

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mosc
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PostPosted: Tue Jun 22, 2004 5:02 pm    Post subject: Reply with quote  Mark this post and the followings unread

The Barberpole Flanger is great. I've never heard this one. It's quite like the Shepard Tone - it just keeps going up and up. It's such a simple patch. Here's a screen scrape and an mp3 file.


barberpole-flanger.jpg
 Description:
Screen shot of the barberpole fanger patch
 Filesize:  31.23 KB
 Viewed:  16144 Time(s)

barberpole-flanger.jpg



barberpole-flanger.mp3
 Description:
Barberpole Flanger

Patch by Ian Sayer
Recorded by Howard Moscovitz

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 Filename:  barberpole-flanger.mp3
 Filesize:  1.46 MB
 Downloaded:  1077 Time(s)

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seraph
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Joined: Jun 21, 2003
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PostPosted: Tue Jun 22, 2004 11:48 pm    Post subject: Reply with quote  Mark this post and the followings unread

mosc wrote:
This is too neat for non G2 owners.

Here's an mp3 of Jamos' Shepard Tone.

Thanks beloved MasterPatch!
I have the impression to hear the cycle of the pitch going up and then starting back down again Shocked Is it me Question
jamos wrote:
the bombardier on the Enola Gay

I once played in a band called "Pianola Gay" but we did not use Shepard Tones Idea Shocked

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Last edited by seraph on Thu Jun 11, 2009 2:17 am; edited 1 time in total
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ian-s



Joined: Apr 01, 2004
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Location: Auckland, New Zealand
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PostPosted: Wed Jun 23, 2004 2:34 am    Post subject: Reply with quote  Mark this post and the followings unread

seraph wrote:

It's nice to have a little chat every once in awhile with a smart ass like you


Razz Who's the smart ass?
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seraph
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PostPosted: Wed Jun 23, 2004 3:53 am    Post subject: Reply with quote  Mark this post and the followings unread

g2ian wrote:
seraph wrote:

It's nice to have a little chat every once in awhile with a smart ass like you


Razz Who's the smart ass?

I do not know why this quote ended up on the wrong thread but I was talking to Elektro80, my Viking friend Very Happy

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jamos



Joined: Jun 01, 2004
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Location: Eugene, Oregon, USA
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PostPosted: Wed Jun 23, 2004 7:07 am    Post subject: Reply with quote  Mark this post and the followings unread

seraph wrote:
I have the impression to hear the cycle of the pitch going up and then starting back down again Shocked Is it me Question


No, I hear it too. I think that is aliasing, though I'm not sure.
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mosc
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PostPosted: Wed Jun 23, 2004 9:33 am    Post subject: Reply with quote  Mark this post and the followings unread

Here is a Shepard Tone generated on a Kyma system. There are a bunch of adjustments I could fiddle with to make it a closer match to Jamos' patch, but it's interesting as it is for comparison purposes.

I think you're right, Jamos, about the aliasing. The MP3 encoding is having a detrimental effect on these examples.


kyma-shepard-tone.mp3
 Description:
Shepard Tone made with a Kyma system.

Recorded by Howard Moscovitz

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 Filename:  kyma-shepard-tone.mp3
 Filesize:  1.39 MB
 Downloaded:  1252 Time(s)

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ian-s



Joined: Apr 01, 2004
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PostPosted: Thu Jun 24, 2004 12:44 pm    Post subject: Reply with quote  Mark this post and the followings unread

My apologies Carlos, I incorrectly assumed you were just exorcizing your razor sharp wit. Which BTW, makes this site an amusing place to visit.
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seraph
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PostPosted: Thu Jun 24, 2004 3:05 pm    Post subject: Reply with quote  Mark this post and the followings unread

g2ian wrote:
My apologies Carlos, I incorrectly assumed you were just exorcizing your razor sharp wit. Which BTW, makes this site an amusing place to visit.

apologies accepted salut but my name isn't Carlos

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ian-s



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PostPosted: Thu Jun 24, 2004 4:15 pm    Post subject: Reply with quote  Mark this post and the followings unread

ooops, my mistake again, sorry Carlo

To much LDS in the 60's Wink
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seraph
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PostPosted: Fri Jun 25, 2004 5:09 am    Post subject: Reply with quote  Mark this post and the followings unread

g2ian wrote:
To much LDS in the 60's Wink

Are you talking about The Church of Jesus Christ of Latter-day Saints (LDS) Question Shocked

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ian-s



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PostPosted: Mon Jun 28, 2004 12:47 pm    Post subject: Reply with quote  Mark this post and the followings unread

No, that's a quote, Kirk explaining Spocks odd behaviour in the Star Trek movie with the whales.
Actually, I didn't try LSD till the late 70's. I don't know what people see in it Wink
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djfoxyfox
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PostPosted: Tue Jul 06, 2004 2:15 pm    Post subject: Reply with quote  Mark this post and the followings unread

mosc wrote:
The Barberpole Flanger is great. I've never heard this one. It's quite like the Shepard Tone - it just keeps going up and up. It's such a simple patch. Here's a screen scrape and an mp3 file.
Unfortunately, my G2 is in the studio two floors below this computer. Could you post the actual patch? That would make it a lot easier to transport to the G2.

BTW, a guy I knew at Ohio State University made an EM piece from a Shepard Tone patch he did on a Moog modular. He generated the pitch control voltage with a battery, resistor and charging capacior. He started the patch and the tape recorder and went away for an hour. (Long time constant!)

Cheers,

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mosc
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PostPosted: Wed Jul 07, 2004 5:52 pm    Post subject: Reply with quote  Mark this post and the followings unread

The barber pole patch is posted, just look more carefully...
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djfoxyfox
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PostPosted: Wed Jul 07, 2004 6:12 pm    Post subject: Reply with quote  Mark this post and the followings unread

mosc wrote:
The barber pole patch is posted, just look more carefully...
Thanks! I must have scrolled by too fast...
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ian-s



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PostPosted: Sat Jul 10, 2004 4:28 am    Post subject: Reply with quote  Mark this post and the followings unread

Thought I had better update the flange patch, as V1.2 no longer has mix out. The new version simply uses a 2-1 switch for manual direction control. If you require 'voltage controlled' direction then use a x-fade instead. I also put a more musically relevant example in variation 2 (for those not so much into noise).


BarberPoleFlange.pch2
 Description:
V1.2 Barberpole flanger by Ian Sayer

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 Filename:  BarberPoleFlange.pch2
 Filesize:  2.93 KB
 Downloaded:  1012 Time(s)

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djfoxyfox
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PostPosted: Sat Jul 10, 2004 6:26 am    Post subject: V1.2 Reply with quote  Mark this post and the followings unread

g2ian wrote:
Thought I had better update the flange patch, as V1.2 no longer has mix out.
New software for the G2? Will it load existing patches?

Cheers,

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egw



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PostPosted: Sat Jul 10, 2004 6:44 am    Post subject: Reply with quote  Mark this post and the followings unread

V1.2 will run patches from 1.0 or 1.1
but they changed a couple of modules, so it's not 100% compatible.
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