AndreasKrebsBlog

The A-118 is an analog noise generator which can produce continuous random voltages as well. Easy to use and quite versatile.

Details can be found on Doepfer’s homepage:

 http://www.doepfer.de/a118.htm

We start with some pure “white” noise, until ca. 0:22. Then I blend over to the “colored” noise (I’ve put white and colored outputs into an A-134-1 VC Panner, which can do crossfading as well). “Blue” and “Red” knobs are both set to zero. After ca. 0:35, I start increasing the “Blue” noise (high frequencies) until maximum. Starting around 0:53, I’m, adding “Red” noise as well, also until max is reached. After 1:10, the “Blue” noise is diminished, after 1:25, the “Red” one as well.

Starting at 1:43, we have some white noise put through an A-108 VCF (bandpass output used), to show some of the random voltage capabilities. At first, modulation intensity (on the A-108) is increased, after 2:05, I start turning up the “Red” knob - which influences the behaviour of the random voltages. After this, some variations with increased resonance on the A-108.

Here we go:

http://www.andreaskrebs.de/assets/media/A-118.mp3

Have fun,

Andreas

The A 101-2 is a vactrol based lowpass gate. Any questions? Lowpass gates (LPGs) are devies that can act as lowpass filters as well as amplifiers. And a combination of both. So, well, why not simply use a lowpass filter and a VCA? Two reasons: A LPG can be switched between these three modes. In case of Doepfer’s even voltage controlled by means of a gate signal. And the filter will behave different if used “pure” or in VCF/VCA combination (especially the amount of resonance). Ah, and a vactrol based VCA sounds different from a “normal” VCA (well, that’s three reasons…)

For technical details, take a look at Doepfer’s homepage:

http://www.doepfer.de/a1012.htm

As in most filter demo patches, there are three A-110 VCOs (sawtooth waves used, 1 VCO 1 oct down) driven by an A-155/156 sequencer, mixed and sent into the A-101-2 LPG. LPG modes are switched by a random module (A-149-2) synced to the Sequencer. Filter cutoff and / or amplification is controlled by an A-149-1 random module and (with attenuator) by an A-140 ADSR. Finally, we go into an A-132-3 VCA. The latter VCA is not essentially necessary, since our “filter” can act as a VCA, too, but it will show some interesting effects, since both VCAs are quite different.

We start with no filter resonance, a moderate LPG input level, no ADSR modulation on the LPG as well as on the A-132-3. Then I start increasing ADSR modulation on the LPG. Next (around 0:50) filter resonance is increased, followed by input level (we get some fine distortion from the LPG). Then the A-132-3 is modulated by the A-140 (instead of simple “gain” level). And some final tweaks of modulation dephts / resonance level.

Here we go:

http://www.andreaskrebs.de/assets/media/A-101-2.mp3

Have fun,

Andreas

A happy new year 2011 to all of you! And thank you very much for your kind support and interest in all those weird things I do!

Web statistics tells me there have been more than 109 thousand visitors to my pages (this is a huge step compared to 39.000 visitors in 2009 or 27.000 visitors in 2008). Whoever your are: thanks a lot and I hope you liked what you found here!

Most popular piece of music was Arkana (e.g. part 17, part 02 with more than 3.000 downloads each) and my orchestral symphony (especially movements no. 2 & no. 4 with far more than 2.000 downloads each). Doepfer A-100 Sound examples seem to be quite popular too: fine to see that this this is useful for you (and it’s lot of fun using these modules). Ah, and I’m quite happy to see there are hundreds of downloads for my analog modular improvisations each month as well.

I wish you all the best for the next year - may all your dreams come true! (same procedure as EVERY year)

Andreas