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- Order number: 150016
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Combination of a voltage controlled LFO (successor of the A-147), a VCA and a voltage controlled delay unit.
All three parts can be used individually but in combination you can (very easily due to normalizations) fade in the LFO after having received a gate, e.g. for a delayed tremolo or delayed vibrato.
The LFO has four wave forms (sine, triangle, square and sawtooth), it's frequency can be voltage controlled and the LFO has a reset input.
Voltage level ranges: -4V to +4V for triangle, sine and square and 0-8V for sawtooth. Frequency range without CV influence: 0.0005Hz to ~200Hz
The VCA has a linear curve and can be used as a voltage controlled attenuator or as a voltage controlled polarizer.
The delay has to be considered an attack-only envelope with a linear characteristic which is fired when receiving a gate at the "delay reset" input. The delay time (or the attack time to be precise) can be controlled manually or with a voltage.
and now to the combined use: The LFO's triangle output is normalized to the VCA's signal input. the "delay" envelope output is normalized to the CV input if the VCA. If now the delay receives a gate the attack envelope is fired, the rising voltage slowly opens the VCA and thus the LFO's amplitude is rising. Voilá, we have a delayed LFO which we can use for tremolos when connected to another VCA or for vibrato when connected to VCO pitch or for whatever you like.
A-147-2 auf Doepfers Seite;http://www.doepfer.de/a1472.htm
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.