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- Order number: 120106
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The A-131 is a VCA with a exponential characteristic and is intended for controlling the level of audio signals by voltages. Improved version since 2013
Not only control voltages can be used to "open" the VCA and to let the audio pass through, there is also a manual gain control. This is pretty handy when you want to modulate the VCA with a bi-polar voltage - just turn up the gain haf-way - this way you can use the CV's negative signal parts to close the VCA.
As the module has two signal inputs often you don't need a mixer before the VCA.
A-131 auf Doepfers Homepage;http://www.doepfer.de/a130.htm; Bedienungsanleitung (für A-130 und A-131, pdf);http://www.doepfer.de/a100_man/a130_%20anl.pdf
WIth a long trajectory building synths, MIDI keyboards and designing bespoke devices for music pioneers Kraftwerk, Dieter Doepfer decided to design his own modular synthesizer in 1995 based on existing electrical and mechanical specifications of lab equipment he used during his years at university. The official presentation of the system at 1996 Frankfurt Musikmesse caught everyone by surprise and created lots of interest. After Doepfer published the specifications on his website, many instrument designers and engineers saw the potential of the new Eurorack format. Doepfer continues expanding their catalog of over 200 modules (and counting), operating from their modest offices in the outskirts of Munich.