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Showing posts from October, 2011

Doepfer A110 Filtering Demo's with A-101-2 and A-120 by Raul Pena

Raul Pena ( from ) made another excellent set of tutorial videos.
This time it is all about filtering; In a few episodes he explores all functions of the A-101-2 Vactrol Low Pass Gate filter, in comparison with the A-120 Low Pass Moog-style filter.
Very interesting stuff again...

Video 1: Doepfer A110 Filtering with A101-2 and A120 Intro
" Short Introduction into Filtering the Doepfer A110 Standard VCO. Dicusses Features and Functions of the Doepfer A101-2 Low Pass Gate and A120 VCF Low Pass Filter.Sound and Video by Raul Pena. "

Video 2: Doepfer A110 Filtering with A101-2 Low Pass Gate
" Demonstration of the Filtering of the Doepfer A110 VCO with an A101-2 Low Pass Gate. Next More Filtering with the A101-2 Low Pass Gate."

More video after the break -

Hardcore Modding the A-182-1 Switched Multiples

I must admit i am not a very sophisticated modifier / solderer. I don't have an electronic background, find it hard to concentrate at times, and i can easily lose my patience when i'm working on stuff. I am quickly satisfied with the modifications that i do, as long as my projects look good on the outside and are safe (i.e. no loose wires inside that can cause short-circuiting etc.)
A good example of my somewhat rude approach is my A-182-1 Switched Multiples modification.
Originally this module is a simple passive multi-connector similar to the A-180 Multiples module.
In the A-182-1 each socket is equipped with a 3-position switch that allows to connect the corresponding socket to the internal bus #1 (left position), bus #2 (right position) or to turn the socket off (center position).
I wisely decided to split up the A-182-1 into a 2 x 4 Multiplier, like i did with my A-180 because I found this this modification very handy.
I can now use my modified A-182-1 Switched Multiple for qui…

SiteTip VI : MIT Open Courseware Music and Technology: Algorithmic and Generative Music

It's kinda weird that, if you search well, there are 2 Music and Technology Courses on the site of the Massachusetts Institute of Technology (MIT) with the same course number (21M.380).

I blogged about one earlier (Contemporary History and Aesthetics, find the blogpost with an interesting 80-minute video HERE) and i am still very enthusiastic about it, but the other one is also very informative.

This course, Algorithmic and Generative Music, as taught in spring 2010 by Christopher Ariza examined " ...the history, techniques, and aesthetics of mechanical and computer-aided approaches to algorithmic music composition and generative music systems. Through creative hands-on projects, readings, listening assignments, and lectures, students will explore a variety of historical and contemporary approaches. "

Surfing through the pages of this course you will find a lot of interesting information on (analog) sound, music history and much more, again accompanied by many links to ot…

A-157 Trigger Sequencer Update

Here's an update on the long-awaited A-157 (or whatever the module-number will be) Trigger Sequencer module.
I wrote about this highly interesting module earlier, you can find that post HERE

This is what Dieter Doepfer's feedback was, when this step-sequencer got mentioned this week in the Doepfer A-100 Usergroup :

" will definitely come !
At present we are waiting for the new PCB prototype with 16 x 8 buttons and LEDs.
Our first plan to use two pc board with 8x8 buttons and LEDs did not work because this would cause a gap between the steps 8 and 9 because of the space required for the PCB connectors.

Our plan is to separate the 16x8 button/LED board from the control unit as it seems that there are two groups of users: those who vote for a simple, easy to use (and soon available) version and those for a "sophisticated" version with additional features (probably with LC display to handle all functions).
The plan for the simple version is to have only two cloc…

Quick Tip VIII : Mounting the A-174-2 Wheels Module

Please be aware of this when you want to install an A-174-2 Wheels Module in your A-100 rack;

As the potentiometer of the left wheel projects about 10 milimeters beside the rim of the front panel, a 2 or 4 HP blind panel has to be mounted left from the module. "

Unless the module left to the A-174-2 has sufficient space in this area of course.Like an A-174-1 Joystick Controlled CV, for example.

None of the A-100 modules that are 4 HP wide fit there...

Installing the A-100NT5 +5Volts Adapter (old type)

Some of the A-100 modules, for instance the A-113 Subharmonic Generator and MIDI-modules A-190 or A-191, need an extra 5 Volts power supply. The old way was by doing this with the A-100NT5 5 V supply, but because installing it was 'suitable for qualified personnel only because of electrical safety' Doepfer doesn't sell these adapter anymore.

The 5V power supply needs to be mounted near to the main power input, on the blank upper back panel with four stand-offs, nuts, serrated washers, and bolts.  Newer back panels (since summer 1999) are already equipped with the 4 mounting holes required for the 5V supply.
If you are considering installing and connecting the A-100NT5, it’s crucial to take note of the following safety instructions: • The installation and connection of the A-100NT5 must only be carried out by a qualified electrician or technician.
• If no suitable expert is available, the rack must be sent to a service centre or direct to Doepfer Musikelektronik
for the power…

Filters V : A-120 24 dB/Oct Low Pass Moog Style Filter VCF1

Perhaps the best known low-pass filter in analogue synthesis was developed by Dr Robert (Bob) Moog in the late sixties.

It was used in the modular Moog synthesisers of that decade, but it got really popular in 1970 with the introduction of the Minimoog.

Moog's 4-pole filter is built with a co-called "transistor ladder" design with a cut-off slope of -24 dB/octave. That’s what gives it its classic, legendary Moog sound.
 Resonance is adjustable all the way up to self-oscillation - in which case the filter behaves like a sine wave oscillator.

The Doepfer A-120 is a very nice Moog emulator, but still most reviews say it doesn't sound 'Moogy' enough.
( i sadly don't have a real Moog to compare and verify that )
Moog's original circuit was flawed because it exhibited a small amount of distortion. Many engineers would have tried to correct this but Moog didn't.
He probably found that the sound was musically pleasing and he was probably right...
Maybe th…

My Main Live Configuration

An interesting topic popped up on the A-100 Facebook Group recently;
" How do you guys trigger your analogue synths sounds on live gigs? "
I do change my setup from time to time, but i do have some kind of basic setup for my live-sets and jams.
I have a total of 5 VCO's in my A-100 system, and i try hard to get the most out of it every time i play.

At the heart of my setup there is a drum-section, consisting of a Roland R-8 and an Elektron SPS-1 Machinedrum. The Electron is a perfect machine with plenty of  electronic drum sounds, i use the R-8 for the more 'organic' drumsounds.

Synchronizing over MIDI is controlled by the R-8, through the Machinedrum and through a Doepfer MSY-2 MIDI-to-SYNC converter straight into the MAQ 16/3 Sequencer.
The MSY-2 is used to keep my TB-303 basslines in sync with the rest.
I also use the CV and Gate outputs from the TB, i get back on this later.

The MAQ 16/3 is Doepfer's MIDI Analog Sequencer.
It has 3 sequencer rows of 16 st…

A-110 VCO Tutorials from Raul Pena

Raul Pena, who already brought us the A-188-1 BBD tutorials, recently published six new video tutorials.
This time the focus is on the A110 VCO:

Video 1 : Doepfer A110 Features and Functions " Explanation of Features and Functions of the Doepfer A-110 Standard VCO Module. Next in this series Audio Demonstration of Waveforms and Pulse Width Modulation.Sound and Video by Raul Pena. "

More video after the break:

SiteTip V : PatchPierre Facebook Page

Time for a shameless self-promotion post;

In case you didn't know already, the PatchPierre Facebook Page is live since the end of august.
Feel free to follow me there too for the latest blog updates, extra video's, links and (perhaps) more in-depth information and discussions.

You will also find my modification pictures, neatly organized in a special Module Modification Folder. More pictures will be posted soon...

If you have questions, suggestions or other remarks you may also post them on my Facebook page.
( Your comments on the blogposts below are still welcome too )

Find it HERE