Random Video: Epoch Modular 'Benjolin' with Doepfer A-143-9 and A-135-1 by isvisible

Another nice Eurorack video by isvisible popped up on Vimeo today:

Video: Epoch Modular 'Benjolin' with Doepfer A-143-9 and A-135-1

Epoch Modular 'Benjolin' with Doepfer A-143-9 and A-135-1 from isvisible on Vimeo.
" I wanted to make a video showing off the many facets of the Benjolin, but got carried away with it and only covered a little bit.
There were only three modules used... an Epoch Modular version of the Benjolin (originally designed by Rob Hordijk), and two Doepfer modules, an A-143-9 Quadrature LFO which is modulating the VCA's in the A-135-1 Quad VCA / VC Mixer.
The A-143-9 is in turn being modulated by the Rungler out on the Benjolin.

Four audio channels were taken from the Benjolin and into the Quad VCA.
1 - LPF.
2 - XOR.
3 - HPF
4 - PWM
There was slight panning of the four channels in my mixer (Output 1 slight left, to output 4 slight right) then recorded with no external effects or any additional modulation."

For more info on the Benjolin by Epoch Modular please visit epochmodular.net/benjolin.html

Find music by isvisible at:

isvisible.co.uk

isvisible.bandcamp.com

Doepfer A-135-1 Quad VCA/ VC Mixer Tutorial Videos by Raul Pena

Time for another new tutorial series by Raul Pena.
The subject this time is the Doepfer A-135-1 Quad VCA /Voltage Controlled Mixer (version 2)

Video 1: Doepfer A135-1 QVCA/VCMIX basics

" A short description of the beasic features and functions of the Doepfer A135-1 Quad Linear VCA, Voltage Controlled Mixer. Sound and Video by Raul Pena."

Video 2: Doepfer A135 Quad Linear VCA/ Voltage Controlled Mixer Audio Demonstration One
" A short demonstration of A135 Quad Linear VCA with oscilloscope views to show how external cv effects amplitude of an audio signal. Sound and Video by Raul Pena."

Video 3: Doepfer A135 Quad Linear VCA/ Voltage Controlled Mixer Audio Demonstration Two

The second of two Audio Demonstrations of A135 Quad Linear VCA with oscilloscope views to show how external cv effects amplitude of an audio signal. Sound and Video by Raul Pena.

New videos in this series will be added to this post weekly on Thursdays.

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

Doepfer A-135-1 Voltage Controlled Mixer Re-Design

Old version of the A-135

The original A-135 module was a simple quad voltage controlled mixer.
It was made of 4 independent linear VCA's, mixed to one common output.
For each VCA the following inputs and controls were available: audio input with attenuator, control voltage input with attenuator, gain (pre-amplification).
The VCA's were realized with high-quality CEM VCA's (CEM3381).

The module could be used for voltage controlled mixing of up to 4 audio signals with separate control voltages (e.g. by LFO's, ADSR's, Random, Shepard generator, MIDI-to-CV interface or other control voltage sources).

In June last year, Doepfer announced the re-design of several modules because of shortage of CEM3080 Chips that were used in this A-135 and other modules.
This year a few of these re-designed modules were released, each in a slightly extended/ improved version (like the A-130/131 that are now also DC-coupled, and the recently announced A-141-2).*

A-135-1 Redesign of the A-135

This new version of the A-135 also has some nice extras in the form of a Sum Out and 4 single outputs for each channel instead of only one (Mixed) Audio output on the original A-135.
They've also managed to make it only 18 HP instead of  22 HP wide.

The new version of the A-135-1 is also able to process slowly varying control voltages because the signal in/outputs are DC coupled.

The new version is manufactured from May 2013 and is available now.

* More re-designs were also promised to us last year, like the A-107, A-116, A-127, A-132-1, A-147, A-171), so that promises a lot for the future...

Find more about various Doepfer re-designs via http://patchpierre.blogspot.nl/search/label/Re-design