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 Forum index » Clavia Nord Modular » G2 Building Blocks
Noodle Modulator
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Rob



Joined: Mar 29, 2004
Posts: 578
Location: The Hague/Netherlands/EC
G2 patch files: 109

PostPosted: Sun Aug 20, 2006 8:48 am    Post subject:  Noodle Modulator
Subject description: Very slow random LFO source with useful properties for noodling
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Today I hacked a building block together which features two interdependent outputs having slowly fluctuating output values. An important property is a constantly varying acceleration/deceleration in the change of the output values. A property that is very useful to e.g. modulate a swinger (a patch with two identical sections that crossmodulate each other) or a delaytime parameter.
Basically the building block is a swinger itself.

The building block falls into the category of 'Sources of Uncertainty', but behaves more predictable compared to e.g. a Wogglebug-type of circuit.

There are two sinewave LFO's at the core. For each sinewave it is checked if the slope is increasing or decreasing. Whenever the slope changes from increasing to decreasing (at the positive peak of the waveform) a value is sampled in a S&H. Vice versa (at the negative peak of the waveform) a value is sampled in a second S&H. A crossfader is used to 'interpolate' between the two S&H output values, controlled by the sinewave from the LFO. This circuit is duplicated and each part takes its S&H input values from the other LFO output. By detuning the LFO's and feedback of the output signals to the LFO rate inputs a pseudorandom signal is generated that is always 'curved', meaning that if the idea is translated to a complex pendulum model the acceleration is never constant but always changing (due to the LFO sinewaves).

The idea is simple, but the implementation a bit less simple as I wanted this building block to work at the very slow rates of the [Rate Sub] setting of the LFOs. At really slow rates it is not at all easy to detect a peak in a sinewave, but this building block seems to work at the [Rate Sub] LFO rate.

There are three parameters:
SPEED - Overall rate
SPREAD - Detune between both LFOs
WILD - Feedback of the outputs to the respective LFO rates

Opening the WILD knob with a bit of SPREAD turns the output patterns into a chaotic region.

The grey modules are just a thingy with a delay line to show how this acceleration/deceleration issue affects the detuning of a fixed frequency of a waveform (which slowly morphs between a sine and a saw) with a modulated echo-line set to the typical flanging 'shrieking hinges' style of echo feedback. But the patch is really about the yellow modules.

Have fun,
/Rob


NoodleModulator.pch2
 Description:
Two interdependent fluctuating values with a varying accelaration/deceleration in the change of values. Can be set to really slow LFO rates.

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 Filename:  NoodleModulator.pch2
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ian-s



Joined: Apr 01, 2004
Posts: 2565
Location: Auckland, New Zealand
Audio files: 42
G2 patch files: 601

PostPosted: Sun Aug 20, 2006 6:10 pm    Post subject: Reply with quote  Mark this post and the followings unread

Thanks Rob

Inspirational.
Different types of noodles have names? Does this come from NM1 culture?
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Rob



Joined: Mar 29, 2004
Posts: 578
Location: The Hague/Netherlands/EC
G2 patch files: 109

PostPosted: Mon Aug 21, 2006 5:20 am    Post subject: Reply with quote  Mark this post and the followings unread

g2ian wrote:
Thanks Rob

Inspirational.
Different types of noodles have names? Does this come from NM1 culture?


Well, I guess the name 'swinger' is even much older. Like from the time people used three-head stereo tape recorders and two-recorder tape loop setups, together with assorted stuff like EMS Synthi's, stompboxes, etc. But I'm not sure, I got the name 'swinger' for this particular type of 'symmetrical' patching from Joachim Nies (some may remember his vibrant circuit bending performance at EM2005).

I guess real 'noodlers' have their own private pet names for certain types of setups. Well, I do.

Most names for particular electronic or electroacoustic setups are probably limited to a small local scene or a small 'incrowd'. Like e.g. 'long wire' does indicate something using many meters of piano string, preferrably running through a whole building. But a 'short wire' you e.g. connect on one side to a piece of wood that you keep on the floor with your foot while you stretch the wire by hand at the other end (where the wire end is wrapped around a little piece of wood). A 'ceramic buzzer' is put somewhere on the wire with e.g. a paperclip and run into e.g. a guitar rig. There are many ways to play both 'long wire' and 'short wire', like the obvious plucking, hitting, bowing, eBow'ing, hurdygirdy-type wheels, etc., or using little motors to excite the strings some way or another.
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3phase



Joined: Jul 27, 2004
Posts: 1144
Location: Berlin
Audio files: 13
G2 patch files: 138

PostPosted: Tue Aug 22, 2006 5:39 pm    Post subject: Reply with quote  Mark this post and the followings unread

Smile real hardware modular synthesis...
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