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 Forum index » Clavia Nord Modular » G2 Patches - Experimental
Shift register canon
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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: Sun Aug 22, 2004 1:48 pm    Post subject: Shift register canon Reply with quote  Mark this post and the followings unread

Here's a patch that uses the shift register to create a canon - musicial that is, where on voice plays another voice delayed by a certain number of beats. Here the shift register is used to delay the second voice (on the right channel) by 8 clock ticks. This is much more efficient than delaying the audio through a delay.

You need two shift registers, one for the pitch control voltage (excuse the old terminology - but I'm old) and one for the gates. There is a third pseudo-canonic voice that is sent to both channels. It's clocked at one half the rate of the other two voices. I threw those in to demonstrate how you can use a flip-flop as a divide-by-two clock. Also, this sub-sampled voice technique is a great way to create multi-part music.

This isn't intended to be a composition or anything, just posting a patch to show an idea and hopefully generate some discussion. If there is not discussion, that's cool too; don't feel compelled to comment if you don't want to.


Shifty canon.pch2
 Description:
This patch demonstrates how to use a couple of shift registers to create a musical canon.

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 Filename:  Shifty canon.pch2
 Filesize:  2.42 KB
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ian-s



Joined: Apr 01, 2004
Posts: 2575
Location: Auckland, New Zealand
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PostPosted: Wed Aug 25, 2004 12:07 am    Post subject: Reply with quote  Mark this post and the followings unread

I like this one. I think the logic modules are a problem for some users, even some experienced synthesists, because they have no obvious equivalent in most synthesis environments. Smallish patches concentrating on one or two main points are easier to study.
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mosc
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Joined: Jan 31, 2003
Posts: 17618
Location: Allentown, PA
Audio files: 125
G2 patch files: 60

PostPosted: Wed Aug 25, 2004 8:07 am    Post subject: Reply with quote  Mark this post and the followings unread

When I was a lot younger, I met Stanley Lunetta in California. I immediately became a deciple. Stan was making home brew synthesizers out of chips and other parts he got a local electronics surpluss stores. At that time we could get SSI and MSI parts very cheaply. We built oscillators by hooking up inverters in feedback loops with RC, resistor cacitor, networks to set the speed. We'dl wire up logic gates and binary up/down counter chips directly to banana jacks on the front pannel. Everything was of course square waves. You'd patch up a logic circuit almost like you'd patch an analog synths only there was no audio or control sigs, everything was just a digital signal.

The shift registers were our favorite chips because we could make canons. Our shift registers were only digital, that is to say they would shift just one bit along the chain. We also used modulo N divider chips to generate melodies, as they would divide a frequency by whatever binary input was provided on their inputs. The shift register would have a pattern of walking ones that would be connected to the Modular N Dividers, in whatever order you wanted. This was a nice melody maker.

These systems we usually quadraphonic, but there wasn't much correlation between what was coming out of each speaker, except for canons made with shift registers.

I found playing around with these home made synths, we called them Lunettas, more fun than playing the Moog Modular system.

So, us Lunetta makers know synths that have only logic modules, no fancy oscillators, envelope generators, filters etc. Building Lunettas was how I got hooked into electronics which eventually got me into the profession. At my interview at Bell Labs a few years later, I told the engineers about my Lunetta experience and they hired me. They were crazy too, I guess.
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paul e.



Joined: Sep 22, 2003
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PostPosted: Wed Aug 25, 2004 10:15 am    Post subject: Reply with quote  Mark this post and the followings unread

great story and information Cool
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