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Showing posts from August, 2012

Random Video: TheVoltageControl's Doepfer A-100 Modular System

I spotted this nice Doepfer Modular video on the always interesting blog.
It is exactly what the accompanying text says... a short demo of his current Doepfer system.

Video: Doepfer Modular System

" A short demo of my current Doepfer modular system."

Uploaded by TheVoltageControl on YouTube

Filters VIII: Doepfer A-106-5 SEM Filter

Yay... finally a new filter-module :-)
Last week i treated myself with an A-106-5 SEM Filter.
The A-106-5 is a 12dB multimode filter that is based on the filter circuit of the Oberheim SEM module (Synthesizer Expander Module), Oberheim's first official analog synthesizer that was produced from 1974 to 1979.

On the outside it looks quite like the A-124 Wasp filter, but sound-wise they are very different.
The filter is equipped with a band pass output and a combined low/notch/high pass output.
For this output a control knob defines the relation between low and high pass signal.
If both signals appear at the same level (i.e. middle position of the Mix knob) one obtains a notch filter. Otherwise the low or high pass signal predominates.
The module sadly does not feature self oscillation in contrast to most of the other filters of the A-100 system.

I had heard some good things about it, and it really sounds incredible.
I do have a slight preference for 12dB filters (like the A-121 Mu…