Showing posts with label Waveshaper. Show all posts
Showing posts with label Waveshaper. Show all posts

Thursday, September 03, 2015

Doepfer A-136 Distortion/Waveshaper Tutorial Videos by Raul Pena

Raul Pena published new videos demonstrating the A-136 Distortion/Waveshaper Module

Module A-136 is a distortion and waveshaping module with extensive control possibilities. The incoming audio or cv signal is internally divided into 3 sections:
- positive component of the signal with adjustable clipping level (even externally via jack socket) and positive or negative amplification (+/-) of this component
- negative component of the signal with adjustable clipping level (even externally via jack socket) and positive or negative amplification (+/-) of this component
- original signal with positive or negative amplification (+/-)

Different settings of 5 distortion/waveshaping parameters enable a lot of very complex and extreme waveform modifications. The range of modifications reaches from simple soft or hard clipping to completely altered waveforms where the original signal is no longer recognizable.
The sketch below shows only a few examples when using a triangle as input signal.

Applications: audio distortion (especially in combination with filters very interesting), waveform modification for audio signals as well as for control voltages (LFO, ADSR, random etc.).

Video: Doepfer A136 Distortion/Waveshaper Basics and Demos (Full Playlist)

Friday, November 28, 2014

Animodule V9A VC Sequencer / Waveshaper / Complex Envelope Demo by @DivKid

Animodule V9A
DivKid's latest Eurorack tutorial video is all about the Animodule V9A Voltage Controlled Sequencer / Waveshaper / Complex Envelope

" The V9A is a powerful animal to add to your sequencing arsenal.
Send your CV to the CV In. As the Voltage increases the sequence steps forward.
As the voltage decreases the sequence steps back.
Scale and adjust your input voltage to taste with the Onboard Attenuator and Offset.
Control the Output CV with an individual Potentiometer for each step.
When a step changes, a 10MS trigger is sent to it's corresponding switch. If the latching switch is depressed it allows the trigger to pass to the Trigger Out.
There is a switch per step for slew (portamento/slide).
and a Potentiometer to control the Slew Amount.
There is also an input to allow gated control of when the slew turns on and off which will work in conjunction with the switches."

Width: 14HP Depth: 39mm

Video: Animodule V9A

" A great module for some custom modulation even sequence, bendy LFO (through on board slew), gate trigger, CV sequencing. All sorts going on.
As always fire away with any questions and hit like and subscribe for more videos every week."

Video by Ben Wilson / DivKid - www.youtube.com/divkidvideo

Thursday, October 31, 2013

Doepfer A-144 Morphing Controller/ Waveshaper Video Tutorials by Raul Pena

Time for another brand new tutorial series by Raul Pena.
The series that started today is all about the Doepfer A-144 Morph Controller/ Waveshaper
Enjoy!

Video 1: Doepfer A144 Morph Controller Basics

" A short look at the Doepfer A144 Morph Controller. Includes a discussion of some of the basic features and functions of the the A144. This module is intended as an expander unit for the Doepfer A135 Voltage Controlled Mixer.Sound and video by Raul Pena."

Video 2: Doepfer A144 Morph Controller- Audio Demo Part One-Basic Morphing

" A short demonstration on the basic morphing with the Doepfer A144 Morph Controller. Sound and Video by Raul Pena."

Video 3: Doepfer A144 Morph Controller-Audio Demo 1-Basic Morphing continued

" A short demonstration on the basic morphing with the Doepfer A144 Morph Controller. Part Two of Two.Sound and Video by Raul Pena."

Video 4: Doepfer A144 Morph Controller-Audio Demo 2-Basic Waveshaping Part One

" The next audio demonstration in the Doepfer A144 Morph Controller series. This week we look at the use of this module as a basic Waveshaper. Sound and Video by Raul Pena."

Video 5: Doepfer A144 Morph Controller Audio Demo Part Two-Basic Waveshaping Continued

" The Next section of the Doepfer A144 Morph controller Series. We review the "wave shaping" using the A144. Review discussion from last time, includes Audio demonstrations.Sounda and Video by Raul Pena.
For Article on Interpolating Scanner
by Juergen Haible
http://www.jhaible.com/tonline_stuff/jh_ipscan.html "

Video 6: Doepfer A144 Morph Controller-Experimenting with A144 and Conclusion Part One

" Part one of two in the final segment in the Doepfer A144 Morph Controller series. A demonstration of patching with various effects. Sound and Video by Raul Pena."


Video 7: Doepfer A144 Morph Controller-Experimenting with A144 and Conclusion Part Two

Part Two of two in the final segment in the Doepfer A144 Morph Controller series. A demonstration of patching with various effects. 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:

Wednesday, November 28, 2012

A-136 Pre-amp Modification

I discovered another nice light-weight DIY-project on the Doepfer DIY-page.

Locating the R2 resistor
It seems that the A-136 Distortion/Waveshaper module contains an internal pre-amplifier that is used to amplify the input signal by about 3.5 before it is processed by the A-136.
Especially for low level audio signals (e.g. output from a VCF) this is useful.

But for all signals with a level beyond ~ 7V this causes clipping before the internal processing takes place. 
Especially for the processing of LFOs or unfiltered VCOs this may cause a problem.

The wiring, additional pictures
on the PatchPierre Facebook page
To totally bypass the internal pre-amplifier, resistor R2 can be removed (e.g. by pinching off).

R2 is the resistor in the upper third of the pcb which is very close to the rear edge.
When R2 is removed the amplification of the internal pre-amplifier becomes "1" (which means that it does no longer amplify).

Finished modified A-136 

Because i love to keep myself busy (I'm slightly ADD-ish), i decided to add a switch to the module, so i can switch between pre-amplifier on and off modes.
It looked like an easy project, so... what could go wrong? ;-)

Besides the front-panel it was a pretty easy job;
I desoldered one side of the R2 resistor, bent it over towards the switch, and wired it with black wire.
After that i soldered another wire (red) from the switch to the hole where R2 used to be. Easy as that.

Now i can manually switch the internal amplifier on and off when required.
The clipping did annoy me at times and now i prevent that and try the un-amplified signal with alternate settings*.
it's not a groundbreaking project, but a nice extra.

* In addition one has to pay attention that the knob positions may vary a bit from the front panel printing because of mechanical tolerances of the potentiometers and knobs (i.e. "0" is not always exactly the neutral position for "A", "+A" or "-A")

The modifications described on this site will most likely void any warranty and, if not done carefully, can damage the circuit board, IC chips, and faceplates.
PatchPierre can not be held responsible for any damage.

Tuesday, February 01, 2011

A-136 Distortion / Waveshaper

The A-136 Distortion/Waveshaper module is a nice distortion/wave-shaping module with external CV control possibilities. It can be used for audio-distortion, but also to modify control voltages ( create new control waveforms made from LFO, ADSR, or Random voltages ) with it.

The module divides the incoming signal into 3 different components; the positive, the negative and the original signal. The 5 knobs and the 2 CV inputs let you adjust the positive and negative amplification and the clipping levels.

With all the different different settings you can create complex wave-shapes and impressive sounds, but to be fair, i have heard better (extended?) distortions. This might perhaps be the reason why Doepfer advices you to use it in combination with filters... not sure though...

For mild and subtle distortions this module sounds alright, but the wilder, clipping distortions are a bit too extreme for me.
Personally i prefer the A-137 Wave Multiplier or the A-116 WP Waveform Processor controlled by random voltages, for the more interesting ( subtle and extremer ) wave-shaping.