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Linear mixer for mixing up to 4 signals to one output. Works best with CVs, but audio is possible, too. If there´s no jack in input 1, you can use the level control 1 as an offset control.
Due to it´s linear characteristic the A-138a is well suited to mix control voltages. Audio signals can be mixed as well but you have accept an imperfect behaviour of the pots.
If the first input is not connected you can use the first potentiometer as an offset control for creating a constant offset voltage. By a jumper you can determine if the offset is active and if it goes from -5V to 0V or from 0V to +5V.
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.
