Quotes I : Edgar Varèse

"I dream of instruments obedient to my thought and which with their contribution of a whole new world of unsuspected sounds, will lend themselves to the exigencies of my inner rhythm."

Edgard Varèse 

Filtering

A filter is a device for eliminating selected frequencies from the soundspectrum, and in some cases to emphasize the level of other frequencies.

Lowpass filter: Removes frequencies above its cutoff frequency

Highpass filter: Removes frequencies below its cutoff frequency

Bandpass filter: Only allows frequencies to pass through above and below a specified range

Notch filter: Allows frequencies to pass between specified ranges ( = Band-Reject filter )

CD-Tip II : Popular Electronics by Philips Research Lab

This 4-CD Boxset with the subtitle  " Early Dutch Electronic Music from Philips Research Laboratories 1956 - 1963 " is a collection of great (restored) works from the Dutch pioneers in electronic sound.

These four CD's contain hard-to-find compositions and sound-examples from the groundbreaking Philips NatLab studios in Eindhoven, the Netherlands.
Pioneers from that time like Dick Raaijmakers,Henk Badings and Tom Disseveld were already working on electronic sounds in the late 1950's, and this collection of Dutch electronic and tapeloop-music is the most complete one ever compiled.

The boxset includes 7 booklets (180 pages) and a few mini-posters, full with background information on the history of Philips NatLab and the composers and technicians of that time. You will also find all the CD details in these books, as well as lots of pictures, scores, schematics and other related documents.

 Popular Electronics: Early Dutch electronic music from Philips Research Laboratories, 1956-1963 by Basta Music

Additional info on this  Popular Electronics  4CD Boxset
BastaMusic: Cat. Nr.: 3091 412

A Question of Cables

Doepfer sells  patch-cables for the A-100 system (3.5 mm plug mono jack) in many different colors and sizes.
The latest addition to the Doepfer assortiment are the orange 50 centimeter patchcables with angled plug on one side. 

The prices are fairly acceptable, and the more you buy ( at once ) the cheaper they get each...
Sizes vary from 15 (yellow), 30 (black) , 50 (grey), 80 (red) , 120 (blue) to 200 (green) centimetres, but i wish they also had other lengths. (...and colors)

Let me know in the comments if you know a place where they sell patch-cables in other colors or lenghts, it will be appreciated.
Purple ones would be nice... but not too long... ;-)

Never Enough VCO's

The engines or hearts of all modular synthesizers are definetely the VCO's. As main sound source for your patches it seems you never have enough of them.

I own 5 VCO's at the moment, One A-111 High End VCO plus four A-110 Standard VCO's. Ideal for stacking layers of waveforms to make extra- fat sounds, and also very useable for multiple A-100 melodylines

The A-111 is the one i use most because of its extended possibilities. 

This VCO has an extended frequency range, improved waveforms, FM and Soft Sync inputs plus an extra fine-tune-controller. Ideal for controllerfreaks like me. 

It produces sine, triangle, pulse and sawtooth waveforms, which are all derived from the triangle oscillator, what does make it hard to produce perfect sine-waves ( but a little better as the A-110's sine wave )

One of the best things is that all 4 waveforms are all simultanously available at the outputs for your mixing pleasure.

The much cheaper A-110  has less controls and is based on a sawtooth oscillator. All outcoming waveforms of this module are derived from this sawtooth by internal waveform converters. This module also generates sinewaves that are not completely perfect, but to 'normal' ears this is hardly audible

I never noticed, and i guess most of us don't care and never noticed the imperfect-ness of the sinewaves of both modules.

Even on an oscilloscope it is hardly visible that the sinewaves are nothing more than rounded sawtooth-waves.

For a perfect sine wave Doepfer recommends the A-143-9 Quadrature LFO/VCO, another interesting module, that i will highlight in a future blogpost.

Note: As the special circuit CEM3340 used in the A-111 High End VCO module is no longer available the module has to be discontinued. Sales at Doepfer while stocks last !

A-100 Module Circuit Board (Picture)

Most of the Doepfer A-100 modules' circuit boards are really pretty. It is almost a shame to build them into a case...

They almost look like a well-architected mini-city on a tiny Doepfer-board, almost like LEGO- miniature-city.

Patchpierre MiniQuiz:    What A-100 Module is this?*

* Answer is HERE - feel free to take the short Poll; "  Analogue or Analog?  "

Analog Noise vs. Digital Noise

My Doepfer A-100 system includes 2 Noise different generators, the A-118 Noise/Random Voltage Generator, and the A-117 Digital Noise Generator.

A noise generator is an oscillator that produces an internal noise signal, typically white or pink noise.

Noise Generators produce random signals, containing harmonics on all frequencies, and can be modified into the desired tone. 

The A-118 produces white and colored noise. The white noise is the well-known 'hiss'.

The spectrum for the white noise has the same amount of energy in every section. 

The colored noise output of the module is a mix of blue noise ( high frequency component ) and red noise ( low frequency component )

Noise in the audio spectrum can be used in many ways, most commonly in wind-effects, or in cymbal crashes and hi-hat -sounds.

The A-117 Digital Noise sounds very different and has less control possibillities.

This module has 2 outputs, consisting of mixes of multiple oscillators to re-create vintage Roland TR-808 and TR-606 sounds like the hi-hat, cymbals and cowbell.

One output has a mix of 2 fixed digital oscillators, that can be used as a basis for the distinctive 808 cowbell-sound, the outher output has 6 oscillators to form cymbal and hi-hat sounds.

The Random outputs of both modules can be used as a Control Voltage for all kinds of stuff. I prefer the Analog Noise for that, simply because it has more controllers.

I often use it as a modulation source to add subtle changes in a filter (check out a short example HERE), but these modules can also provide interesing effects in combination with the A-148 Sample and Hold module. More on that in a later post...

Video: A-118 Demo 

A118 Noise and Random voltage generator demo made by @Hawklord2112