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 Forum index » Clavia Nord Modular » G2 Building Blocks
Random Ramp circuit with behavior controls
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davep



Joined: Jul 05, 2004
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Location: Oakland, CA
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PostPosted: Sat Dec 03, 2005 3:38 pm    Post subject: Random Ramp circuit with behavior controls Reply with quote  Mark this post and the followings unread

Hi all,

Here's circuit that provides a random ramp modulation signal. It behaves differently than the Random modules in a few ways, and it provides some controls to modify the behavior of the signal. This idea was inspired partly by the Function Generators found in the Emu Morpheus.

In this example, the circuit is located in the FX area (the first two columns) and the output is the triangle osc, which in this case is used to randomly sweep a phasor.

It's based on the same principle as 'soft sync'. It uses an osc tuned to zero Hz, with small amounts of linear FM from a pair of Constant modules providing positive & negative DC signals. These signals are randomly switched by a random pulse signal provided by the FlipFlop module, which causes the triangle wave to change direction at random times.

Since it's based on a triangle wave, each 'segment' is a linear up or down ramp, as opposed to the rounded signal from the Random modules. This provides a more constant motion at a more constant rate than the Random modules.

There are four controls that can be used to alter the behavior of the signal:

- "Master Rate" control, which attenuates the pos & neg DC signals to control the overall amount of FM and therefore the overall ramp rate,

- "Vary Slope" control, which adds a random value to the DC FM control signal each time the ramp changes direction, thus causing each segment to have a different "rate" or "angle",

- "Flip Rate" and "Flip Probability" controls, which interact to control when the ramp changes direction. When the Probability is 100%, the ramp changes direction at a regular rate set by the Flip Rate control. As the probability decreases, the timing of the direction change becomes more random and less often. So you can have a ramp that changes direction exactly every ten seconds by setting the probability to 100% and the flip rate to .1 Hz, or you can have a ramp that still changes direction every ten seconds on the average, but not like clockwork, by decreasing the probability and increasing the flip rate.

Check out the first five variations for examples of the different behaviors. To use this idea in another patch, copy & paste the first two columns from the FX area and use the output of the triangle osc. Enjoy!


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mosc
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Joined: Jan 31, 2003
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PostPosted: Sat Dec 03, 2005 9:54 pm    Post subject: Reply with quote  Mark this post and the followings unread

I can't say I understand this one, but it is very beautiful sounding. A nice stringlike sound.
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davep



Joined: Jul 05, 2004
Posts: 467
Location: Oakland, CA
Audio files: 10
G2 patch files: 73

PostPosted: Sat Dec 03, 2005 11:47 pm    Post subject: Reply with quote  Mark this post and the followings unread

mosc wrote:
I can't say I understand this one, but it is very beautiful sounding. A nice stringlike sound.


Yeah, that whole zero Hz - soft sync concept tends to hover at the periphery of my comprehension. I was having a good brain day Smile

As usual, I got most of the info from Rob & the usual suspects, so folks can find info on these topics in the various tutorials by Rob et al. Of course, I'd be happy to answer any questions about it too, if I can.

Dave

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Blue Hell
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PostPosted: Sun Dec 04, 2005 11:10 am    Post subject: Reply with quote  Mark this post and the followings unread

Nice use of the 0 Hz feature !
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