Doepfer A137-2 VC Wave Multiplier II Tutorials by Raul Pena

A-137-2 Wave Multiplier II

Back in August of this year Raul Pena published his series on the Doepfer A-137-1 Wave Multiplier module (11 parts!)

Now he's back with the first tutorial videos starring the follow-up to this module, the A-137-2.
The A-137-2 is another version of a wave multiplier.
In contrast to the A-137-1 Wavemultiplier I the A-137-2 generates four phase-shifted copies of a VCO signal applied to the audio input. The four shifted signals are added to the original signal to obtain a fat sound similar to five independent VCOs.

Doepfer A137-2 VC Wave Multiplier II (Playlist)

"A short overview of the basic features of the Doepfer A137-2 Voltage Controlled Wave Multiplier II. Includes a short demonstration of a few oscilloscope views. Sound and Video by Raul Pena."

Check out Raul's latest survey at http://www.surveymonkey.com/s/K3Z9PVF

Other places to find Raul's World of Synths on the Web:

raulsworldofsynths on YouTube

raulsworldofsynths on Vimeo

raulsworldofsynths on SoundCloud

raulsworldofsynths at iTunes

raulsworldofsynths at CDBABY

More A-137-2:

Patch-of-the-day with A-137-2 from Navs: 

http://navsmodularlab.blogspot.com/2012/01/patch-of-day-highly-strung.html

http://navsmodularlab.blogspot.com/2012/01/patch-tips-21-getting-animated.html

http://navsmodularlab.blogspot.com/2008/12/doepfer-137-2-wave-multiplier-ii-demo.html

Doepfer A-137-1 Wave Multiplier Video Tutorials by Raul Pena

Raul Pena just published a new video today.
This begins the Doepfer Wave Multiplier series.
Enjoy!

Video 1: Doepfer 137-1 VC Wave Multiplier I Basics

" A basic description of the features and functions of the Doepfer A137-1 Wave Multiplier.
Sound and Video by Raul Pena."

Video 2: Doepfer 137-1 VC Wave Multiplier with Low Frequency signals Part One

" A walkthrough of processing Low Frequency signals using the A137-1 Wave Multiplier. Experimenting with different settings.
Sound and Video by Raul Pena." 

Video 3: Doepfer 137-1 VC Wave Multiplier with Low Frequency signals Part Two

" A walkthrough of processing Low Frequency signals using the A137-1 Wave Multiplier. Experimenting with different settings. 
Sound and Video by Raul Pena "

Video 4: Doepfer A137-1 Wave Multiplier with Audio rate Signals-Triangle Wave Pt.1

" A walkthrough of several different timbres which can be achieved with the A137-1 Wave Multiplier with a simple Triangle Wave. Different experiments with Multiples, Folding level, Symmetry, and Harmonics are shown. Part One of Two.
Sound and Video by Raul Pena."

Video 5: Doepfer A137-1 Wave Multiplier with Audio rate Signals-Triangle Wave Pt.2

" A walkthrough of several different timbres which can be achieved with the A137-1 Wave Multiplier with a simple Triangle Wave. Different experiments with Multiples, Folding level, Symmetry, and Harmonics are shown. Part Two of Two.
Sound and Video by Raul Pena."

Video 6: Doepfer A137-1 Wave Multiplier with Audio rate Signals-Sine Wave Pt.1

" A short video exploring the processing of a Sine Wave with the Doepfer A137 Wave Multiplier. Part One of Two.
Sound and Video by Raul Pena."

Video 7: Doepfer A137-1 Wave Multiplier with Audio rate Signals-Sine Wave Pt.2

" A short video exploring the processing of a Sine Wave with the Doepfer A137 Wave Multiplier. Part Two of Two. Sound and Video by Raul Pena." 

Video 8: Doepfer A137-1 Wave Multiplier-Modulation with Control Signals-Simple Modulation Part One

" An exploration into the simple modulation of the Doepfer A137-1 Wave Multiplier.Part One of Two.
Sound and Video by Raul Pena."

Video 9: Doepfer A137-1 Wave Multiplier-Modulation with Control Signals-Simple Modulation Part Two

" An exploration into the simple modulation of the Doepfer A137-1 Wave Multiplie with two modulation sources.Part Two of Two.

Sound and Video by Raul Pena."

Video 10: Doepfer A137-1 Wave Multiplier-Modulation with A149 Quantized/Stored Random Voltages Pt.1

"Continuing the A137-1 series with modulation. This time we begin modulating with the A149-1 Random Voltages.Part One of Two. Sound and Video by Raul Pena. "

Video 11: Doepfer A137-1 Wave Multiplier-Modulation with A149 Quantized/Stored Random Voltages Pt.2

" Continuing the A137-1 series with modulation. This time we begin modulating with the A149-1 Random Voltages.Part Two of Two. Sound and Video by Raul Pena." 

Check out Raul's latest survey at http://www.surveymonkey.com/s/K3Z9PVF

Other places to find Raul's World of Synths on the Web:

raulsworldofsynths on YouTube

raulsworldofsynths on Vimeo

raulsworldofsynths on SoundCloud

raulsworldofsynths at iTunes

raulsworldofsynths at CDBABY

A-137 Wave Multiplier

I might have underrated the A-137-1 Voltage Controlled Wave Multiplier a bit. Until lately...

The basic idea of a wave multiplier is to multiply the waveform of an incoming signal and add harmonics to a signal that contains none or only a few harmonics (e.g. sine or triangle waveform)
The A-137 can be used with signals rich in harmonics too (e.g. saw) but the effect is not as remarkable as for triangle or sine waves.
For rectangle signals none or only little effects are obtained.

The A-137 is a very interesting module, in a way it is quite similar to the A-136 Distortion/Waveshaper
You can compare it with four simple A136 modules in series. (The A136 is basically like a guitar distortion stompbox with different distortion levels for the positive and the negative parts of the signal.)
Only in this module you do not have separate access to the two half waves and to the parameters of the individual stages.

The parameters of the A-137 are:
- Multiples: defines the number of basic wave multiplications within one period.
- Folding Level and Symmetry: the upper and lower clipping levels of the wave folder units are controlled.
- Harmonics: adds some harmonic content by sharpening the waveform edges and adding overshoot peaks. It works a little bit like the resonance control of a VCF.

All 4 parameters can be manually adjusted and controlled by external voltages.

It is a lot of fun to experiment with this module, with all different parameters controlled by different CV sources like LFO, ADSR's, Ribbon Control pressure and sequenced triggers for example.

The only thing i dislike about this module is the unpredictability factor.
You should be carefull for a 'damping' effect that can occur when different parameters interact with eachother.
But on the other hand; the module is fully DC coupled, so even CV signals can be messed up with this module.

Check out the audio examples on the Doepfer site that explain the function of the module and its parameters.