doepfer a-143-2 quad adsr price : $265.00

the a-143 series of modules contain multiple modulation sources. module a-143-2 is a four-fold adsr type envelope generator. other modules of this series are the complex envelope generator a-143- (quad ad) and the quad lfo a-143-3.

the module contains 4 independent adsr-type envelope generators. each sub-module has available the controls attack, decay, sustain and release. the three-position range switch allows to select the desired time range (low - high - medium). the adjustable envelope time ranges from several minutes to less than 100 microseconds. on top of this each sub-module is equipped with three digital outputs (high/low): "end of attack (eoa)", "end of decay (eod)" and "end of release (eor)". as soon as the criterion is valid (e.g. end of decay state) the corresponding digital outputs turns to "high". these outputs can be used e.g. to daisy-chain several adsr sub-modules. for this the digital output in question (eoa, eod or eor) has to be connected to the gate input of the following adsr. even automatically running envelopes (pseudo lfos) or so-called "quadrature envelopes" with cyclical modulations of several ring-shaped, daisy-chained adsrs are possible. to obtain a pseudo lfo simply the eod or eor output has to be connected to the gate input of the same adsr.



in addition to the obligatory gate (g) input for envelope generators each sub-module has available a retrigger (rt) input. the retrigger turns the direction to "upward" if the envelope has already reached the decay state while the retrigger pulse occurs. if the envelope is still in the attack phase the retrigger input has no meaning. this a different behaviour from a-140 and a-141!

all gate inputs are normalled from top to bottom, i.e. the gate input of the above sub-module is connected to the switching contact of the succeeding module. thus only one gate signal can be used to trigger all four sub-modules. but even other types of normalling are possible if desired (e.g. eod or eor of the above adsr to the gate input of the succeeding sub-module).

the envelope outputs are displayed with leds.

if voltage control of all parameters is required module a-141 is available.



this module has a maximum current draw of 70ma. it requires 26 te/hp worth of space to fit in a eurorack frame.

to view this module's user manual as a pdf file, please click here.