Vocoder Slew Limiter / Attenuator / Offset Generator

Note: Per Doepfer's A-129 Vocoder-Subsystem page, the A-129 series is no longer available.

The Five-way VC slew limiter / offset generator / attenuators (A-129 /3) and Slew controllers (A-129/4) are particularly designed for this purpose. Module A-129 /3 includes 5-way Attenuators, 5-way Offset Generators, and a Slew Limiter (which works on all the voltages at the five CV inputs simultaneously). Using the A-129 /3 just on its own, two functions are available:

Attenuator: whatever signal is patched into the CV input can be attenuated by your chosen amount before being sent to the CV output. The attenuation is set with a control knob.

Offset Generator: whatever signal is patched into the CV input will have an offset voltage added to it before being sent to the output. The offset is variable with a control knob.

The Slew Limiter function is only available if the Slew Control Input of the module A-129/3 is controlled by the Slew Limiter Controller A-129/4.

For the maximum extension of the vocoder three modules A-129/3 are required as the A-129/3 contains only 5 units but the complete vocoder has 15 frequency bands. Usually, the A-129/3 is patched between the CV outputs of the analysis section A-129/1 and the CV inputs of the synthesis section A-129/2. You can also use module A-129 /3, particularly in combination with A-129/4, for other purposes. For example, using the A-129/2 synthesis section only, you can make a filterbank.

Module A-129/3 can also be used out of a vocoder to attenuate any signal in the A-100 and to add a fixed offset voltage (e.g. to expand the features of the dual low cost VCA A-132, the Quantizer A-156 or the Sampler A-112).

Module A-129/3 is suitable only for the processing of control voltage signals. It cannot be used to process audio signals.

For more detailed information please look at the English user's manual of A-129/3 and /4: http://www.doepfer.de/a100_man/A1293man.pdf


  • 40 mA +12V
  • 40 mA -12V
  • 0 mA 5V
  • 60 mm deep
  • Ø 3.67 (3 Votes) Average Rating

This Module is discontinued.

$145 Price in € submitted Oct 6th 2012, 13:36 by MacroDX | last Change Jun 19th 2017, 13:06 by modulargrid

10 Users are observing this